static.cloudflareinsights.com Open in urlscan Pro
2606:4700::6810:5e41  Public Scan

Submitted URL: http://static.cloudflareinsights.com/
Effective URL: https://static.cloudflareinsights.com/
Submission: On September 26 via manual from US

Summary

This website contacted 1 IPs in 1 countries across 1 domains to perform 13 HTTP transactions. The main IP is 2606:4700::6810:5e41, located in United States and belongs to CLOUDFLARENET - Cloudflare, Inc., US. The main domain is static.cloudflareinsights.com.
TLS certificate: Issued by COMODO ECC Domain Validation Secure S... on September 10th 2019. Valid for: 6 months.
This is the only time static.cloudflareinsights.com was scanned on urlscan.io!

urlscan.io Verdict: No classification

Domain & IP information

IP Address AS Autonomous System
1 14 2606:4700::68... 13335 (CLOUDFLAR...)
13 1
Apex Domain
Subdomains
Transfer
14 cloudflareinsights.com
static.cloudflareinsights.com
148 KB
13 1
Domain Requested by
14 static.cloudflareinsights.com 1 redirects static.cloudflareinsights.com
13 1

This site contains no links.

Subject Issuer Validity Valid
ssl713275.cloudflaressl.com
COMODO ECC Domain Validation Secure Server CA 2
2019-09-10 -
2020-03-18
6 months crt.sh

This page contains 1 frames:

Primary Page: https://static.cloudflareinsights.com/
Frame ID: AB79347ED321611A02CFD5513D3F727F
Requests: 13 HTTP requests in this frame

Screenshot


Page URL History Show full URLs

  1. http://static.cloudflareinsights.com/ HTTP 301
    https://static.cloudflareinsights.com/ Page URL
  2. https://static.cloudflareinsights.com/ Page URL

Detected technologies

Overall confidence: 100%
Detected patterns
  • headers server /^cloudflare$/i

Page Statistics

13
Requests

100 %
HTTPS

100 %
IPv6

1
Domains

1
Subdomains

1
IPs

1
Countries

148 kB
Transfer

199 kB
Size

3
Cookies

Page URL History

This captures the URL locations of the websites, including HTTP redirects and client-side redirects via JavaScript or Meta fields.

  1. http://static.cloudflareinsights.com/ HTTP 301
    https://static.cloudflareinsights.com/ Page URL
  2. https://static.cloudflareinsights.com/ Page URL

Redirected requests

There were HTTP redirect chains for the following requests:

Request Chain 0
  • http://static.cloudflareinsights.com/ HTTP 301
  • https://static.cloudflareinsights.com/

13 HTTP transactions

Resource
Path
Size
x-fer
Type
MIME-Type
/
static.cloudflareinsights.com/
Redirect Chain
  • http://static.cloudflareinsights.com/
  • https://static.cloudflareinsights.com/
5 KB
5 KB
Document
General
Full URL
https://static.cloudflareinsights.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
bef92e5856170c7b8a979e93c2f187e97b192b894a05e5040f64649f8c0b444d

Request headers

:method
GET
:authority
static.cloudflareinsights.com
:scheme
https
:path
/
pragma
no-cache
cache-control
no-cache
upgrade-insecure-requests
1
user-agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
accept
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
sec-fetch-site
none
accept-encoding
gzip, deflate, br
Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

status
522
date
Thu, 26 Sep 2019 18:01:31 GMT
content-type
text/html; charset=UTF-8
set-cookie
__cfduid=d3749beb3a19582d239e17b10dc1877621569520861; expires=Fri, 25-Sep-20 18:01:01 GMT; path=/; domain=.cloudflareinsights.com; HttpOnly; Secure cf_ob_info=522:51c7240558d4cba8:VIE; path=/; expires=Thu, 26-Sep-19 18:02:01 GMT cf_use_ob=443; path=/; expires=Thu, 26-Sep-19 18:02:01 GMT
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
expires
Thu, 01 Jan 1970 00:00:01 GMT
cache-control
no-store, no-cache, must-revalidate, post-check=0, pre-check=0
pragma
no-cache
server
cloudflare
cf-ray
51c7240558d4cba8-VIE

Redirect headers

Date
Thu, 26 Sep 2019 18:01:00 GMT
Transfer-Encoding
chunked
Connection
keep-alive
Cache-Control
max-age=3600
Expires
Thu, 26 Sep 2019 19:01:00 GMT
Location
https://static.cloudflareinsights.com/
Vary
Accept-Encoding
Server
cloudflare
CF-RAY
51c72404e80d8c68-VIE
cf.errors.css
static.cloudflareinsights.com/cdn-cgi/styles/
28 KB
5 KB
Stylesheet
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Requested by
Host: static.cloudflareinsights.com
URL: https://static.cloudflareinsights.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
e2dba22a9ee028e3aa09baa7c36e14c86effba2516862aad01019c06e757b375
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
no-cors
Referer
https://static.cloudflareinsights.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:31 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-6eeb"
vary
Accept-Encoding
content-type
text/css
status
200
cache-control
max-age=7200, public
cf-ray
51c724c55fcccba8-VIE
expires
Thu, 26 Sep 2019 20:01:31 GMT
opensans-300.woff
static.cloudflareinsights.com/cdn-cgi/styles/fonts/
15 KB
14 KB
Font
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/fonts/opensans-300.woff
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Origin
https://static.cloudflareinsights.com
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:31 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-3dfc"
vary
Accept-Encoding
content-type
application/font-woff
status
200
cache-control
max-age=7200, public
cf-ray
51c724c5782fcba8-VIE
expires
Thu, 26 Sep 2019 20:01:31 GMT
error_icons.png
static.cloudflareinsights.com/cdn-cgi/images/
16 KB
16 KB
Image
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/images/error_icons.png
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
no-cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:31 GMT
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
"5d88dce8-4177"
vary
Accept-Encoding
content-type
image/png
status
200
cache-control
max-age=7200, public
accept-ranges
bytes
cf-ray
51c724c57830cba8-VIE
content-length
16759
expires
Thu, 26 Sep 2019 20:01:31 GMT
opensans-400.woff
static.cloudflareinsights.com/cdn-cgi/styles/fonts/
16 KB
14 KB
Font
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/fonts/opensans-400.woff
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Origin
https://static.cloudflareinsights.com
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:31 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-3e40"
vary
Accept-Encoding
content-type
application/font-woff
status
200
cache-control
max-age=7200, public
cf-ray
51c724c57831cba8-VIE
expires
Thu, 26 Sep 2019 20:01:31 GMT
opensans-600.woff
static.cloudflareinsights.com/cdn-cgi/styles/fonts/
16 KB
15 KB
Font
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/fonts/opensans-600.woff
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Origin
https://static.cloudflareinsights.com
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:31 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-3eb8"
vary
Accept-Encoding
content-type
application/font-woff
status
200
cache-control
max-age=7200, public
cf-ray
51c724c57838cba8-VIE
expires
Thu, 26 Sep 2019 20:01:31 GMT
Primary Request /
static.cloudflareinsights.com/
7 KB
7 KB
Document
General
Full URL
https://static.cloudflareinsights.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
1318d119341beee3213853d9b777ef5be22c38258651bb310aee08aa8b63b326

Request headers

:method
GET
:authority
static.cloudflareinsights.com
:scheme
https
:path
/
pragma
no-cache
cache-control
no-cache
upgrade-insecure-requests
1
user-agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
sec-fetch-mode
navigate
accept
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3
sec-fetch-site
same-origin
referer
https://static.cloudflareinsights.com/
accept-encoding
gzip, deflate, br
cookie
__cfduid=d3749beb3a19582d239e17b10dc1877621569520861; cf_ob_info=522:51c7240558d4cba8:VIE; cf_use_ob=443
Upgrade-Insecure-Requests
1
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36
Sec-Fetch-Mode
navigate
Referer
https://static.cloudflareinsights.com/

Response headers

status
522
date
Thu, 26 Sep 2019 18:01:31 GMT
content-type
text/html; charset=UTF-8
cache-control
private, no-store no-store, no-cache, must-revalidate, post-check=0, pre-check=0 no-store, no-cache, must-revalidate, post-check=0, pre-check=0
cf-generated-by
AO-OB
expect-ct
max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
expires
Thu, 01 Jan 1970 00:00:01 GMT
pragma
no-cache no-cache
vary
Accept-Encoding
set-cookie
cf_use_ob=0; path=/; expires=Thu, 26-Sep-19 18:02:01 GMT
server
cloudflare
cf-ray
51c724c59878cba8-VIE
cf.errors.css
static.cloudflareinsights.com/cdn-cgi/styles/
28 KB
5 KB
Stylesheet
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Requested by
Host: static.cloudflareinsights.com
URL: https://static.cloudflareinsights.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
e2dba22a9ee028e3aa09baa7c36e14c86effba2516862aad01019c06e757b375
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
no-cors
Referer
https://static.cloudflareinsights.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:32 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-6eeb"
vary
Accept-Encoding
content-type
text/css
status
200
cache-control
max-age=7200, public
cf-ray
51c724c6fd2fcba8-VIE
expires
Thu, 26 Sep 2019 20:01:31 GMT
retry.png
static.cloudflareinsights.com/cdn-cgi/images/
6 KB
6 KB
Image
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/images/retry.png
Requested by
Host: static.cloudflareinsights.com
URL: https://static.cloudflareinsights.com/
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
06476b5eaf70c0332ed4a8ed5090609cafd2086f85335a73da29c65495243e66
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
no-cors
Referer
https://static.cloudflareinsights.com/
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:32 GMT
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
"5d88dce8-16ec"
vary
Accept-Encoding
content-type
image/png
status
200
cache-control
max-age=7200, public
accept-ranges
bytes
cf-ray
51c724c6fd31cba8-VIE
content-length
5868
expires
Thu, 26 Sep 2019 20:01:31 GMT
opensans-300.woff
static.cloudflareinsights.com/cdn-cgi/styles/fonts/
15 KB
14 KB
Font
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/fonts/opensans-300.woff
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
059fb5b9c3140723dd817f3e0a6dd38b62465864cc6922727ff23a4c4fb157a8
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Origin
https://static.cloudflareinsights.com
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:32 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-3dfc"
vary
Accept-Encoding
content-type
application/font-woff
status
200
cache-control
max-age=7200, public
cf-ray
51c724c71d95cba8-VIE
expires
Thu, 26 Sep 2019 20:01:32 GMT
error_icons.png
static.cloudflareinsights.com/cdn-cgi/images/
16 KB
16 KB
Image
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/images/error_icons.png
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
09b4776a08d6df046909a3a3f54a9b58c858d55c0abbfeade9bbdeabc025118f
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
no-cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:32 GMT
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
"5d88dce8-4177"
vary
Accept-Encoding
content-type
image/png
status
200
cache-control
max-age=7200, public
accept-ranges
bytes
cf-ray
51c724c71d98cba8-VIE
content-length
16759
expires
Thu, 26 Sep 2019 20:01:32 GMT
opensans-400.woff
static.cloudflareinsights.com/cdn-cgi/styles/fonts/
16 KB
14 KB
Font
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/fonts/opensans-400.woff
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
38d3578fac745f8a18cd8068a55f0c45d68c37532e2f85b98be69f32d8ab23ed
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Origin
https://static.cloudflareinsights.com
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:32 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-3e40"
vary
Accept-Encoding
content-type
application/font-woff
status
200
cache-control
max-age=7200, public
cf-ray
51c724c71d9acba8-VIE
expires
Thu, 26 Sep 2019 20:01:32 GMT
opensans-600.woff
static.cloudflareinsights.com/cdn-cgi/styles/fonts/
16 KB
15 KB
Font
General
Full URL
https://static.cloudflareinsights.com/cdn-cgi/styles/fonts/opensans-600.woff
Protocol
H2
Security
TLS 1.3, , AES_128_GCM
Server
2606:4700::6810:5e41 , United States, ASN13335 (CLOUDFLARENET - Cloudflare, Inc., US),
Reverse DNS
Software
cloudflare /
Resource Hash
8662216acfc2aebb92efb59860305bf049548c55dbf3c7507df48d36ec4ae09f
Security Headers
Name Value
X-Frame-Options SAMEORIGIN

Request headers

Sec-Fetch-Mode
cors
Referer
https://static.cloudflareinsights.com/cdn-cgi/styles/cf.errors.css
Origin
https://static.cloudflareinsights.com
User-Agent
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/74.0.3729.169 Safari/537.36

Response headers

date
Thu, 26 Sep 2019 18:01:32 GMT
content-encoding
gzip
last-modified
Mon, 23 Sep 2019 14:55:36 GMT
server
cloudflare
x-frame-options
SAMEORIGIN
etag
W/"5d88dce8-3eb8"
vary
Accept-Encoding
content-type
application/font-woff
status
200
cache-control
max-age=7200, public
cf-ray
51c724c71d9ecba8-VIE
expires
Thu, 26 Sep 2019 20:01:32 GMT

Verdicts & Comments Add Verdict or Comment

2 JavaScript Global Variables

These are the non-standard "global" variables defined on the window object. These can be helpful in identifying possible client-side frameworks and code.

object| onformdata object| onpointerrawupdate

3 Cookies

Domain/Path Name / Value
static.cloudflareinsights.com/ Name: cf_use_ob
Value: 0
static.cloudflareinsights.com/ Name: cf_ob_info
Value: 522:51c7240558d4cba8:VIE
.cloudflareinsights.com/ Name: __cfduid
Value: d3749beb3a19582d239e17b10dc1877621569520861