Autonomous system
AS11736 USD - University of South Dakota
Education ARIN
Summary
University of South Dakota
education university legacy
USD is the University of South Dakota, the state's flagship public university in Vermillion. This is a campus network, and everything in the evidence agrees.
What it's used for
Campus and academic connectivity: students, staff, research and administrative systems, plus the university's medical school. RIS sees 9 IPv4 prefixes, 17,152 addresses, no IPv6, and only 2 observed neighbours. The low neighbour count is the important part. A network with this many addresses would look like a regional provider if it peered widely; two neighbours instead says it is a leaf, taking transit (typically through a state or regional research network) and originating only its own space.
Every prefix registers in ARIN to the University of South Dakota. The handles are unusually legible: NETBLK-COYOTENET and COYOTE-NET are named for the Coyotes, the university's athletic nickname, and USD-EDU is self-explanatory. The SDNET-BLK2-* blocks carve up 206.176.0.0/20 into progressively smaller pieces, the residue of a state-network allocation being subdivided over time.
Notable
One block, 206.176.58.0/24, registers to USD Medical School rather than the university proper. That is an internal departmental registration inside the same institution, not a third party, and it is a good example of why the registrant field must be read for the organisation rather than pattern-matched for exact string equality with the AS holder.
Interesting
No IPv6 is announced in the RIS window, which is a little unusual for a research-adjacent .edu in 2026 and puts USD behind many of its peers on dual-stack. Reverse DNS returned nothing on the twenty addresses sampled, but that is a sampling result and no conclusion should be drawn from 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 2026-11-05, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 8 prefixes · 16.64K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 8 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11736- Registry name
- USD
- Registrant
- University of South Dakota
- Abuse contact
- Cheryl.Tiahrt@usd.edu
- Registered
- 1998-12-03
- Last changed
- 2021-10-18
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 9 valid, 0 with no ROA
- ROAs
- 8 authorising AS11736
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 11 naming AS11736
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: 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