Country
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ASN LANDING PAGE
AS1221
ASN-TELSTRA Telstra Limited
Last updated · Apr 4, 2026
Total prefixes
287
IPv4 prefixes
285
IPv6 prefixes
2
ASN summary
How to read the scale of AS1221
ASN-TELSTRA Telstra Limited currently shows 287 prefixes and 56 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 AS1221?
ASN-TELSTRA Telstra Limited 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 AS1221 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
AS1221 ASN lookupAS1221 BGPAS1221 peersAS1221 prefixesAS1221 upstreamsASN-TELSTRA Telstra Limited ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
AS4637
AS4637
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AS49915
AS49915
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AS9507
AS9507
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AS4764
AS4764
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AS20940
AS20940
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AS60068
AS60068
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AS45437
AS45437
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AS15830
AS15830
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AS132847
AS132847
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AS58511
AS58511
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AS3360
AS3360
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AS63956
AS63956
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AS21859
AS21859
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AS23918
AS23918
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AS20473
AS20473
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AS135879
AS135879
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AS132029
AS132029
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AS45926
AS45926
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AS139341
AS139341
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AS2764
AS2764
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AS56105
AS56105
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AS10235
AS10235
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AS37978
AS37978
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AS63850
AS63850
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AS132484
AS132484
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AS132370
AS132370
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AS59330
AS59330
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AS153589
AS153589
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AS24316
AS24316
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AS136522
AS136522
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AS137924
AS137924
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AS13335
AS13335
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AS3573
AS3573
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AS54113
AS54113
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AS10310
AS10310
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AS32787
AS32787
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AS135887
AS135887
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AS136988
AS136988
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AS58869
AS58869
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AS59267
AS59267
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Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 1.120.0.0/13 | AS1221 | — |
| 1.128.0.0/11 | AS1221 | — |
| 101.103.0.0/16 | AS1221 | — |
| 101.160.0.0/11 | AS1221 | — |
| 103.129.227.0/24 | AS1221 | — |
| 103.136.214.0/24 | AS1221 | — |
| 103.136.215.0/24 | AS1221 | — |
| 103.149.43.0/24 | AS1221 | — |
| 103.150.144.0/24 | AS1221 | — |
| 103.150.145.0/24 | AS1221 | — |
| 103.195.64.0/24 | AS1221 | — |
| 103.226.244.0/23 | AS1221 | — |
| 103.247.118.0/23 | AS1221 | — |
| 103.247.118.0/24 | AS1221 | — |
| 103.247.119.0/24 | AS1221 | — |
| 103.58.212.0/24 | AS1221 | — |
| 103.58.34.0/24 | AS1221 | — |
| 103.58.35.0/24 | AS1221 | — |
| 103.78.241.0/24 | AS1221 | — |
| 110.140.0.0/15 | AS1221 | — |
| 110.142.0.0/16 | AS1221 | — |
| 110.143.0.0/16 | AS1221 | — |
| 110.144.0.0/13 | AS1221 | — |
| 120.144.0.0/13 | AS1221 | — |
| 120.152.0.0/14 | AS1221 | — |
| 120.156.0.0/15 | AS1221 | — |
| 120.158.0.0/16 | AS1221 | — |
| 121.208.0.0/12 | AS1221 | — |
| 122.200.24.0/23 | AS1221 | — |
| 123.209.0.0/16 | AS1221 | — |
| 123.210.0.0/15 | AS1221 | — |
| 124.176.0.0/12 | AS1221 | — |
| 125.255.0.0/16 | AS1221 | — |
| 129.41.78.0/24 | AS1221 | — |
| 136.238.200.0/24 | AS1221 | — |
| 137.147.0.0/16 | AS1221 | — |
| 138.130.0.0/16 | AS1221 | — |
| 138.217.0.0/16 | AS1221 | — |
| 139.130.0.0/16 | AS1221 | — |
| 139.134.0.0/16 | AS1221 | — |
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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 AS1221 represent?
AS1221 is an autonomous system number used to identify an independently operated network. The current page associates it with ASN-TELSTRA Telstra Limited 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 AS1221 page?
They help explain the scale, interconnection depth, and route structure of AS1221. 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 AS1221?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS1221, 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.