Country
—
ASN LANDING PAGE
AS39521
AS39521
Last updated · Apr 4, 2026
Total prefixes
52
IPv4 prefixes
0
IPv6 prefixes
0
ASN summary
How to read the scale of AS39521
AS39521 currently shows 52 prefixes and 47 upstream, downstream, or peer relationships. Larger prefix inventories often indicate broader network footprint, but they should still be read together with country and peering context.
When is an ASN page most useful?
ASN landing pages are more useful than a single IP page when you want cloud provider attribution, routing research, infrastructure comparison, or network topology analysis at the organization level.
How should you read the country, organization, and role of AS39521?
AS39521 is currently associated with an unknown region. Country data is only a starting point; the more important signals are the organization name, website, prefix volume, and peering relationships that reveal whether the network behaves like a cloud platform, ISP, CDN, or enterprise backbone.
What should you inspect next after the AS39521 page?
This page is currently showing live ASN data that can be used for peer, prefix, and network scale analysis. The most useful next step is usually to return to a related IP landing page, then compare that concrete address with this ASN profile and with broader topic pages for routing, cloud attribution, or WHOIS ownership analysis.
Search intents this ASN page helps cover
AS39521 ASN lookupAS39521 BGPAS39521 peersAS39521 prefixesAS39521 upstreamsAS39521 ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
Peers
AS6939
AS6939
—
AS61138
AS61138
—
AS6206
AS6206
—
AS174
AS174
—
AS6830
AS6830
—
AS34019
AS34019
—
AS49434
AS49434
—
AS6057
AS6057
—
AS8298
AS8298
—
AS34177
AS34177
—
AS12637
AS12637
—
AS5405
AS5405
—
AS50304
AS50304
—
AS25091
AS25091
—
AS50673
AS50673
—
AS3170
AS3170
—
AS3214
AS3214
—
AS6424
AS6424
—
AS8283
AS8283
—
AS24482
AS24482
—
AS41666
AS41666
—
AS47692
AS47692
—
AS50629
AS50629
—
AS50869
AS50869
—
AS199524
AS199524
—
AS212635
AS212635
—
AS559
AS559
—
AS8218
AS8218
—
AS12779
AS12779
—
AS24961
AS24961
—
AS25160
AS25160
—
AS25220
AS25220
—
AS29075
AS29075
—
AS29140
AS29140
—
AS31027
AS31027
—
AS34288
AS34288
—
AS35280
AS35280
—
AS39122
AS39122
—
AS41327
AS41327
—
AS45489
AS45489
—
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 143.20.104.0/24 | AS39521 | — |
| 143.20.124.0/24 | AS39521 | — |
| 143.20.125.0/24 | AS39521 | — |
| 143.20.54.0/24 | AS39521 | — |
| 143.20.6.0/24 | AS39521 | — |
| 143.20.61.0/24 | AS39521 | — |
| 143.20.62.0/24 | AS39521 | — |
| 162.141.80.0/24 | AS39521 | — |
| 162.141.98.0/24 | AS39521 | — |
| 167.148.190.0/24 | AS39521 | — |
| 167.148.40.0/24 | AS39521 | — |
| 185.144.56.0/22 | AS39521 | — |
| 188.191.49.0/24 | AS39521 | — |
| 188.191.50.0/24 | AS39521 | — |
| 188.191.51.0/24 | AS39521 | — |
| 212.107.4.0/22 | AS39521 | — |
| 217.194.153.0/24 | AS39521 | — |
| 2a05:e4c0::/32 | AS39521 | — |
| 2a05:e4c1::/32 | AS39521 | — |
| 2a05:e4c7::/36 | AS39521 | — |
| 2a07:3bc0::/29 | AS39521 | — |
| 45.10.16.0/24 | AS39521 | — |
| 45.10.17.0/24 | AS39521 | — |
| 45.10.18.0/24 | AS39521 | — |
| 45.130.100.0/22 | AS39521 | — |
| 45.88.5.0/24 | AS39521 | — |
| 45.88.6.0/24 | AS39521 | — |
| 45.88.7.0/24 | AS39521 | — |
| 45.95.40.0/24 | AS39521 | — |
| 45.95.41.0/24 | AS39521 | — |
| 68.164.0.0/22 | AS39521 | — |
| 68.165.140.0/22 | AS39521 | — |
| 68.165.176.0/22 | AS39521 | — |
| 68.165.208.0/22 | AS39521 | — |
| 68.165.236.0/22 | AS39521 | — |
| 72.244.124.0/22 | AS39521 | — |
| 74.0.132.0/22 | AS39521 | — |
| 74.0.160.0/22 | AS39521 | — |
| 74.0.200.0/22 | AS39521 | — |
| 74.0.248.0/22 | AS39521 | — |
Related ASN pages
AS15169 · Google
A strong reference ASN for Google DNS, Google Cloud, and global network footprint analysis.
AS13335 · Cloudflare
Useful for analyzing CDN, Anycast, WAF, and large-scale edge network behavior.
AS8075 · Microsoft
Helpful when comparing Azure, enterprise backbone, and large-cloud routing patterns.
AS16509 · Amazon
A useful ASN landing page for understanding AWS and large cloud-network ownership.
Related lookups and next steps
WHOIS vs ASN Ownership Guide
Continue from this ASN into the differences between WHOIS ownership and ASN ownership.
Routing Troubleshooting and Network Analysis
Continue from this ASN into route troubleshooting and network analysis.
Cloud Network and ASN Comparison
Useful when you want to compare this ASN against larger cloud and edge networks.
WHOIS and IP Ownership Guide
Continue from the ASN page into WHOIS and ownership verification.
Frequently asked questions about this ASN page
What does AS39521 represent?
AS39521 is an autonomous system number used to identify an independently operated network. The current page associates it with AS39521 in an unknown region, which helps determine whether it behaves like a cloud provider, ISP, CDN, or enterprise backbone.
What are peers, upstreams, and prefixes useful for on the AS39521 page?
They help explain the scale, interconnection depth, and route structure of AS39521. Richer peering and upstream data often indicate broader network reach, but they should still be interpreted together with prefixes and related IP landing pages.
What should you do after reviewing AS39521?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS39521, then continue into cloud, WHOIS, or routing topic pages to understand the network in a broader context.
Related topics
WHOIS vs ASN Ownership Guide
Understand why WHOIS ownership and ASN ownership can differ, and how to combine both when deciding who really owns or operates an IP.
WHOIS and IP Ownership Guide
Use WHOIS, ASN, prefixes, and organization data to determine who ultimately owns an IP, range, or resolved domain target.
BGP and ASN Basics Guide
Learn what ASN, BGP routes, prefixes, upstreams, downstreams, and peers mean, then explore real ASN pages.
Cloud Network and ASN Comparison
Compare large cloud and edge networks such as Google, Cloudflare, Microsoft, and Amazon through their ASN landing pages.