asn.dev

Autonomous system

AS25979 COMDC-WI - CITY OF MADISON

Unclassified ARIN

IPv4 addresses 4.10K 1 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 1 downstream
Flagged prefixes 0 none

Summary

City of Madison

United States of America · AI-generated

government municipal network

The AS handle COMDC-WI is operated by the City of Madison.

What it's used for

  • The address space is registered under the netname MADISON2 with the registrant CITY OF MADISON; WiscNet NIC, indicating municipal infrastructure.
  • The AS announces 4096 IPv4 addresses in a single /20 prefix and one IPv6 /48 prefix, with only 2 observed neighbours, consistent with a small, self-contained government network.

Notable

  • The registrant CITY OF MADISON; WiscNet NIC aligns directly with the AS holder, confirming the space belongs to the municipality.
  • The inventory consists of a single contiguous IPv4 block and a single IPv6 prefix, typical of a dedicated municipal allocation rather than a multi-tenant or transit provider.

CLASSIFICATION - after the card, on its own final line, emit exactly:

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, 1 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS2381WiscNet101

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-06, 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 · 4.10K addresses IPv6 1 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS25979
Registry name
COMDC-WI
Registrant
CITY OF MADISON
Abuse contact
abuse@wiscnet.net
Registered
2002-06-11
Last changed
2012-03-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
50% valid · 1 valid, 1 with no ROA
ROAs
1 authorising AS25979
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS25979

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: 454 networks and 1,854 prefixes, as published 2026-11-06. 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