Country
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ASN LANDING PAGE
AS39921
DE-RACKSPACE - Rackspace Ltd.
Last updated · Apr 4, 2026
Total prefixes
9
IPv4 prefixes
7
IPv6 prefixes
2
ASN summary
How to read the scale of AS39921
DE-RACKSPACE - Rackspace Ltd. currently shows 9 prefixes and 1 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 AS39921?
DE-RACKSPACE - Rackspace Ltd. 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 AS39921 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
AS39921 ASN lookupAS39921 BGPAS39921 peersAS39921 prefixesAS39921 upstreamsDE-RACKSPACE - Rackspace Ltd. ASN
Upstreams
Detailed data for this ASN is not available right now.
Downstreams
Detailed data for this ASN is not available right now.
Peers
Prefix inventory
| Prefix | Name | Country |
|---|---|---|
| 147.75.24.0/22 | AS39921 | — |
| 159.135.128.0/19 | AS39921 | — |
| 159.135.160.0/19 | AS39921 | — |
| 185.16.216.0/22 | AS39921 | — |
| 185.205.104.0/22 | AS39921 | — |
| 192.68.42.0/24 | AS39921 | — |
| 2a0b:440:860::/43 | AS39921 | — |
| 2a0b:440::/32 | AS39921 | — |
| 72.21.36.0/22 | AS39921 | — |
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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 AS39921 represent?
AS39921 is an autonomous system number used to identify an independently operated network. The current page associates it with DE-RACKSPACE - Rackspace Ltd. 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 AS39921 page?
They help explain the scale, interconnection depth, and route structure of AS39921. 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 AS39921?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS39921, 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.