AS11131 — UMBC-AS
Network type: education
AS11131 announces 3 IPv4 prefixes covering 82,176 addresses and 1 IPv6 prefixes.
About this network
UMBC-AS is the campus autonomous system of the University of Maryland, Baltimore County, the public research university at 1000 Hilltop Circle, Baltimore. It announces the university's own address space and nothing resembling a provider's inventory.
What it's used for
A large research-university campus network. RIS observes just 3 IPv4 prefixes but 82,176 addresses — an unusually high address-per-prefix ratio, explained entirely by the first entry: 130.85.0.0/16, a full class-B-sized block of 65,536 addresses registered to UMBCNET. The other two are 136.160.0.0/18 (16,384 addresses) and 199.201.245.0/24, plus one IPv6 prefix, 2620:0:5300::/44.
This is the profile of an institution that was allocated generous space early and still announces it as a clean aggregate: three routes, no deaggregation, three observed BGP neighbours. Campus traffic — teaching, administration, research computing, residence halls — flows over a handful of upstreams, most likely including the regional research-and-education network alongside commodity transit.
Notable
The registrant of the /18 is not UMBC but COMBNET, whose ARIN organisation is the University System of Maryland — the statewide system UMBC belongs to, registered at System Administration, Adelphi, MD. A prefix registered to a different legal entity than the announcing AS can be an IP-leasing tell; here it is the mundane opposite. The parent university system holds space and a constituent campus announces a slice of it. The remaining blocks (UMBCNET, UMBC-EXT-NET) are UMBC's own direct allocations.
Interesting
The sampled reverse DNS shows the campus core exactly where you would expect it — engcr-apic2-cimc.net.umbc.edu is an out-of-band management interface on a data-centre switch fabric, sitting in the .net.umbc.edu infrastructure zone. One sampled address in the external /24 answers under an unrelated domain, netmasters.com, which is a useful reminder that reverse DNS describes what a piece of space carries, never who holds it.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 130.85.0.0/16
- 136.160.0.0/18
- 199.201.245.0/24
- 2620:0:5300::/44
Upstream networks
- AS6059 University System of Maryland
- AS10886 University of Maryland
- AS33657 Comcast Cable Communications, LLC
Adjacent networks
awaiting query
enter an AS number, IP address, or organisation name above