asn.dev

Autonomous system

AS54439 MCGM-FIBERNET3

Unclassified ARIN

IPv4 addresses 12.80K 11 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

Montgomery County Government

United States of America · AI-generated

government municipal network internal

The AS handle MCGM-FIBERNET3 is held by Montgomery County Government, Maryland.

What it's used for

  • The address space carries internal government network traffic, evidenced by netnames MCGM and MONTGOMERYCOUNTYMDGOV associated with the county's infrastructure.
  • The AS announces 12800 IPv4 addresses across 11 prefixes and maintains a single observed neighbour, indicating a self-contained internal network rather than a transit or access provider.
  • Traffic from this AS consists of internal communications, office workers, and municipal services for the county government, which operates a 24x7 Network Operations Center.

Notable

  • Registrants for the majority of prefixes align with the announcer, specifically Montgomery County Government, Maryland, while two prefixes (192.26.22.0/23 and 192.35.92.0/23) list Various Registries (Maintained by ARIN) as the registrant.
  • The address inventory is finely subdivided into 11 distinct prefixes, reflecting site-by-site segmentation typical of a large internal corporate or government estate.

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
AS40468Montgomery County Government, Maryland821

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, 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 11 prefixes · 12.80K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America11

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS54439
Registry name
MCGM-FIBERNET3
Registrant
Montgomery County Government, Maryland
Abuse contact
joseph.webster@montgomerycountymd.gov
Registered
2020-12-31
Last changed
2021-03-08
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 13 with no ROA
ROAs
0 authorising AS54439
ASPA
no ASPA record
IRR
0% registered · 0 of 13 announcements 4 other origin
Route objects
0 naming AS54439

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: 447 networks and 1,852 prefixes, as published 2026-10-27. 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