Country
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ASN LANDING PAGE
AS3561
CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications
Last updated · Apr 4, 2026
Total prefixes
572
IPv4 prefixes
570
IPv6 prefixes
2
ASN summary
How to read the scale of AS3561
CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications currently shows 572 prefixes and 45 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 AS3561?
CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications 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 AS3561 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
AS3561 ASN lookupAS3561 BGPAS3561 peersAS3561 prefixesAS3561 upstreamsCENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
AS32988
AS32988
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AS10959
AS10959
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AS22064
AS22064
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AS21622
AS21622
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AS29457
AS29457
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AS63427
AS63427
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AS62827
AS62827
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AS14524
AS14524
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AS53288
AS53288
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AS19701
AS19701
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AS396204
AS396204
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AS40026
AS40026
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AS46263
AS46263
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AS20391
AS20391
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AS40738
AS40738
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AS201493
AS201493
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AS396167
AS396167
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AS6989
AS6989
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AS39965
AS39965
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AS40946
AS40946
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AS62520
AS62520
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AS46885
AS46885
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AS64212
AS64212
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AS393738
AS393738
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AS26158
AS26158
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AS36539
AS36539
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AS53687
AS53687
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AS23147
AS23147
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AS394463
AS394463
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AS14688
AS14688
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AS54697
AS54697
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AS394792
AS394792
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AS393697
AS393697
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AS13458
AS13458
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AS22283
AS22283
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AS40685
AS40685
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AS46269
AS46269
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AS54262
AS54262
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AS63458
AS63458
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AS54645
AS54645
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Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 103.11.68.0/22 | AS3561 | — |
| 104.164.158.0/24 | AS3561 | — |
| 104.252.60.0/24 | AS3561 | — |
| 104.253.151.0/24 | AS3561 | — |
| 104.253.173.0/24 | AS3561 | — |
| 104.253.36.0/24 | AS3561 | — |
| 104.253.43.0/24 | AS3561 | — |
| 109.166.40.0/21 | AS3561 | — |
| 109.166.48.0/21 | AS3561 | — |
| 130.193.3.0/24 | AS3561 | — |
| 136.0.106.0/24 | AS3561 | — |
| 136.0.218.0/24 | AS3561 | — |
| 136.0.239.0/24 | AS3561 | — |
| 136.0.85.0/24 | AS3561 | — |
| 140.228.18.0/24 | AS3561 | — |
| 140.228.19.0/24 | AS3561 | — |
| 141.140.10.0/24 | AS3561 | — |
| 141.140.11.0/24 | AS3561 | — |
| 141.140.8.0/24 | AS3561 | — |
| 141.140.9.0/24 | AS3561 | — |
| 142.111.145.0/24 | AS3561 | — |
| 142.111.153.0/24 | AS3561 | — |
| 142.111.181.0/24 | AS3561 | — |
| 142.111.182.0/24 | AS3561 | — |
| 142.111.186.0/24 | AS3561 | — |
| 142.111.197.0/24 | AS3561 | — |
| 142.111.210.0/24 | AS3561 | — |
| 142.111.214.0/24 | AS3561 | — |
| 142.111.222.0/24 | AS3561 | — |
| 142.111.224.0/24 | AS3561 | — |
| 142.111.238.0/24 | AS3561 | — |
| 142.252.55.0/24 | AS3561 | — |
| 149.19.157.0/24 | AS3561 | — |
| 149.19.158.0/23 | AS3561 | — |
| 151.248.72.0/21 | AS3561 | — |
| 151.248.80.0/21 | AS3561 | — |
| 151.248.88.0/22 | AS3561 | — |
| 162.33.165.0/24 | AS3561 | — |
| 162.33.166.0/24 | AS3561 | — |
| 165.140.143.0/24 | AS3561 | — |
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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 AS3561 represent?
AS3561 is an autonomous system number used to identify an independently operated network. The current page associates it with CENTURYLINK-LEGACY-SAVVIS - CenturyLink Communications 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 AS3561 page?
They help explain the scale, interconnection depth, and route structure of AS3561. 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 AS3561?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS3561, 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.