Autonomous system
AS11131 UMBC-AS
Education ARIN
Summary
University of Maryland Baltimore County (UMBC)
education university research legacy
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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-19, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 3 prefixes · 82.18K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 4 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11131- Registry name
- UMBC-AS
- Registrant
- University of Maryland Baltimore County (UMBC)
- Abuse contact
- rays1@umbc.edu
- Registered
- 1998-04-20
- Last changed
- 2019-04-16
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 75% valid · 3 valid, 1 with no ROA
- ROAs
- 3 authorising AS11131
- ASPA
- no ASPA record
- IRR
- 100% registered · 4 of 4 announcements
- Route objects
- 6 naming AS11131
Reputation
Classification and threat
Education University, school or national research and education network.
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 1,783 prefixes, as published 2026-10-20. 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