asn.dev

Autonomous system

AS21631 CHFA-COLORADO

Unclassified ARIN

IPv4 addresses 512 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Colorado Housing and Finance Authority

United States of America · AI-generated

government housing finance us

CHFA-COLORADO is operated by Colorado Housing and Finance Authority.

What it's used for

  • The address space carries infrastructure for a state housing finance agency, with one prefix registered to the authority and one to a telecommunications provider.
  • The AS announces 512 IPv4 addresses across 2 prefixes and maintains 1 observed neighbour, indicating a small, isolated network footprint typical of a single-site corporate or government entity.

Notable

  • Registrants do not fully align with the announcer; 71.4.66.0/24 is registered to Verizon Business with netname XOXO-BLK-26, while 192.30.123.0/24 is registered to Colorado Housing and Finance Authority with netname AS21631.
  • The address inventory is minimal, consisting of two /24 blocks, one of which appears to be leased or historically associated with a major carrier.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS29863Latisys-Denver, LLC120

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 2 prefixes · 512 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS21631
Registry name
CHFA-COLORADO
Registrant
Colorado Housing and Finance Authority
Abuse contact
afuerst@chfainfo.com
Registered
2013-10-28
Last changed
2013-10-28
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS21631
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS21631

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,779 prefixes, as published 2026-10-22. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check