asn.dev

Autonomous system

AS31756 COLORADOSPRINGS-GOV

Unclassified ARIN

IPv4 addresses 2.05K 1 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

City of Colorado Springs

United States of America · AI-generated

government municipal network

The AS handle COLORADOSPRINGS-GOV is held by the City of Colorado Springs.

What it's used for

  • The space carries municipal network operations, evidenced by the netname COSPRINGS and registrant City of Colorado Springs.
  • The inventory consists of 2048 IPv4 addresses within a single /21 prefix (158.120.0.0/21) and 0 IPv6 prefixes. With only 1 observed neighbour, the low address-to-neighbour ratio indicates an internal corporate estate rather than a transit or access provider.

Notable

  • The RDAP registrant City of Colorado Springs aligns perfectly with the AS holder name.
  • The address inventory is a single contiguous block, typical of a municipal government network managing its own infrastructure.

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
AS15221StratusIQ65

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-23, 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 1 prefixes · 2.05K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America1

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS31756
Registry name
COLORADOSPRINGS-GOV
Registrant
City of Colorado Springs
Abuse contact
christopher.porter@coloradosprings.gov
Registered
2011-03-01
Last changed
2012-03-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 1 with no ROA
ROAs
0 authorising AS31756
ASPA
no ASPA record
IRR
0% registered · 0 of 1 announcements
Route objects
0 naming AS31756

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 2026-10-24. 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