AS268

AS268 is a low-numbered, legacy autonomous system registered under ARIN to the Uniformed Services University of the Health Sciences (USUHS), the U.S. federal government's only health-professions academy, located at 4301 Jones Bridge Road in Bethesda, Maryland. USUHS was chartered by Congress in 1972 and operates under the Department of Defense, educating military physicians, nurses, and graduate researchers alongside the adjacent Walter Reed National Military Medical Center. The ASN itself is a small, single-homed stub: it announces exactly one IPv4 prefix, 67.133.232.0/23 (512 addresses), carries no IPv6, and shows just one observed BGP neighbour, indicating a customer/end-user network with no transit role. Routing visibility is full on the v4 side (327 of 327 RIPE RIS peers see it), and the prefix has been continuously routed under AS268 since at least 2000. The registry record is old and partly stale: the only listed point of contact, Michael Karas of Network Solutions, Inc., has been flagged by ARIN as unvalidated with no response since 2010, so contact data should not be relied upon. No abuse signal was found in any major threat feed as of June 2026, though two security incidents have hit the parent institution (a 2015 domain defacement/credential leak and a 2024–2025 LockBit3 ransomware listing) — neither implicates the AS268 network as an attack origin. RPKI posture is unknown: the announced /23 carries no Route Origin Authorization, and bgp.he.net notes a bogon announcement, both routing-hygiene gaps rather than abuse indicators. CAIDA rank and customer-cone metrics could not be retrieved (API returned HTTP 502).

Operator

Uniformed Services University of the Health Sciences (USUHS); ARIN org handle USUHS, AS handle USUHSNET-AS [Confirmed] — ARIN RDAP autnum/268, usuhs.edu/about

Country / RIR

US, ARIN [Confirmed] — ARIN RDAP autnum/268

Allocated

1989-02-09 (ARIN registry date — autnum top-level registration event; NOT an IEEE date, IEEE publishes no ASN dates); last changed 1991-01-10 [Confirmed] — ARIN RDAP autnum top-level events

Org status

U.S. federal government entity under the Department of Defense; the nation's only federal health-professions academy, chartered by Congress in 1972 (Public Law 92-426) [Confirmed] — usuhs.edu/about, ARIN RDAP autnum/268

Contacts

ARIN POC Michael Karas (MK124-ARIN), Network Solutions, Inc., 505 Huntmar Park Drive, Herndon, VA 20165; the POC's personal mailbox and direct line are withheld here — consult the ARIN RDAP record directly. Flagged by ARIN as UNVALIDATED with no response since 2010-06-16, treat as stale

[Confirmed] — ARIN RDAP entity/MK124-ARIN

Security/abuse context (NEUTRAL, DATED)

no notable public abuse signal as of 2026-06-21 — not in Spamhaus ASN-DROP, ipapi.is top-abusive, CleanTalk, AbuseIPDB, or C0nw0nk; no NANOG/Reddit hits. Two org-level incidents affect USUHS (2015 domain defacement + ~45k-email credential leak; 2024–2025 LockBit3 ransomware listing) but neither implicates AS268 infrastructure as an attack origin

Network & routing

Network type

stub / end-user AS — single-homed, no transit, serves a U.S. federal military health-sciences university (government/academic) [Confirmed] — RIPEstat routing-status, bgp.he.net/AS268

Size

one IPv4 prefix 67.133.232.0/23 (512 addresses); zero IPv6 prefixes / addresses [Confirmed] — RIPEstat routing-status / announced-prefixes (resource=268)

Routing/peering

announced and fully visible on v4 (327/327 RIS peers); 1 observed neighbour; no IPv6 (0/322 v6 peers); routing first seen 2000-08-18 (then 192.207.212.0/24), last seen 2026-06-21 [Confirmed] — RIPEstat routing-status. No published peering policy and no PeeringDB record exists for AS268

[Likely] — bgp.he.net/AS268, peeringdb.com (404)

Upstream

single upstream provider AS10886 (University of Maryland) observed [Likely] — bgp.he.net/AS268, ipinfo.io/AS268

RPKI

Unknown — no ROA found for 67.133.232.0/23 via RIPEstat; prefix is neither RPKI-valid nor RPKI-invalid (no authorizing ROA). bgp.he.net additionally notes a bogon announcement — both are routing-hygiene gaps, not abuse [Confirmed] — RIPEstat rpki-validation, bgp.he.net/AS268

CAIDA metrics

as_rank / customer_cone / transit_degree Unknown — CAIDA AS Rank API returned HTTP 502 on this pull; with 1 observed neighbour this is consistent with a stub/customer AS [Unknown] — api.asrank.caida.org (502)

Notable usage

military medical education and research network for USUHS; affiliated with Walter Reed National Military Medical Center; small campus academic/administrative footprint [Likely] — ipinfo.io/AS268, usuhs.edu/about

Analyst note

small single-homed stub ASN registered to a U.S. federal medical university; clean in abuse feeds but carries an old/unvalidated contact, a bogon announcement, and no RPKI ROA. CAIDA rank unavailable this pull (502).