Country
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ASN LANDING PAGE
AS391
AFCONC-BLOCK1-AS - Air Force Systems Networking
Last updated · Apr 4, 2026
Total prefixes
155
IPv4 prefixes
155
IPv6 prefixes
0
ASN summary
How to read the scale of AS391
AFCONC-BLOCK1-AS - Air Force Systems Networking currently shows 155 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 AS391?
AFCONC-BLOCK1-AS - Air Force Systems Networking 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 AS391 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
AS391 ASN lookupAS391 BGPAS391 peersAS391 prefixesAS391 upstreamsAFCONC-BLOCK1-AS - Air Force Systems Networking 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 |
|---|---|---|
| 128.202.0.0/16 | AS391 | — |
| 128.236.0.0/16 | AS391 | — |
| 131.105.0.0/16 | AS391 | — |
| 131.15.116.0/23 | AS391 | — |
| 131.15.119.0/24 | AS391 | — |
| 131.15.120.0/24 | AS391 | — |
| 131.15.136.0/24 | AS391 | — |
| 131.15.144.0/21 | AS391 | — |
| 131.15.16.0/20 | AS391 | — |
| 131.15.160.0/21 | AS391 | — |
| 131.15.208.0/24 | AS391 | — |
| 131.15.233.0/24 | AS391 | — |
| 131.15.234.0/24 | AS391 | — |
| 131.15.235.0/24 | AS391 | — |
| 131.15.236.0/24 | AS391 | — |
| 131.15.237.0/24 | AS391 | — |
| 131.15.238.0/24 | AS391 | — |
| 131.15.239.0/24 | AS391 | — |
| 131.15.252.0/24 | AS391 | — |
| 131.15.253.0/24 | AS391 | — |
| 131.15.32.0/22 | AS391 | — |
| 131.15.38.0/23 | AS391 | — |
| 131.15.40.0/21 | AS391 | — |
| 131.15.48.0/20 | AS391 | — |
| 131.15.64.0/20 | AS391 | — |
| 131.15.80.0/24 | AS391 | — |
| 131.15.90.0/23 | AS391 | — |
| 131.15.92.0/24 | AS391 | — |
| 131.15.98.0/23 | AS391 | — |
| 131.18.1.0/24 | AS391 | — |
| 131.18.128.0/24 | AS391 | — |
| 131.44.0.0/16 | AS391 | — |
| 131.44.120.0/24 | AS391 | — |
| 131.44.121.0/24 | AS391 | — |
| 131.44.247.0/24 | AS391 | — |
| 131.44.248.0/24 | AS391 | — |
| 131.44.249.0/24 | AS391 | — |
| 131.44.251.0/24 | AS391 | — |
| 131.44.255.0/24 | AS391 | — |
| 131.44.32.0/21 | AS391 | — |
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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 AS391 represent?
AS391 is an autonomous system number used to identify an independently operated network. The current page associates it with AFCONC-BLOCK1-AS - Air Force Systems Networking 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 AS391 page?
They help explain the scale, interconnection depth, and route structure of AS391. 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 AS391?
The best next step is usually to return to a concrete IP landing page to see how a specific address maps into AS391, 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.