AS54439 — MCGM-FIBERNET3 - Montgomery County Government, Maryland

AS54439 announces 11 IPv4 prefixes covering 12,800 addresses and 0 IPv6 prefixes.

About this network

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.

Announced prefixes

• 192.26.21.0/24
• 192.26.22.0/23
• 192.26.24.0/24
• 192.35.92.0/23
• 192.41.164.0/22
• 192.41.168.0/23
• 208.76.112.0/24
• 208.76.114.0/23
• 208.76.116.0/23
• 208.76.119.0/24
• 213.18.192.0/19

Upstream networks

• AS40468 Montgomery County Government, Maryland

Adjacent networks

• AS40468 Montgomery County Government, Maryland

Routing security

• RPKI: 0 valid, 0 invalid and 30 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 0% of announcements registered; 0 route objects.
• Listed in as-sets: AS-DBSI, AS-HURRICANE, AS-YIPES, AS40468:AS-ALL.