asn.dev

Autonomous system

AS19321 UMC-HEALTH-SYSTEM

Unclassified ARIN

IPv4 addresses 1.02K 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

University Medical Center

United States of America · AI-generated

education business healthcare

The AS handle UMC-HEALTH-SYSTEM is held by University Medical Center.

What it's used for

  • The address space carries infrastructure for a university medical center, as indicated by the netname UMC-HEALTH-SYSTEM and registrant University Medical Center.
  • The network announces 1024 IPv4 addresses within a single /22 prefix (199.21.252.0/22) and maintains 2 observed neighbours, a ratio consistent with a small, self-contained institutional network rather than a transit provider.

Notable

  • The RDAP registrant University Medical Center aligns directly with the AS handle and the announced prefix netname.
  • The address inventory consists of a single contiguous /22 block, indicating a finely subdivided internal corporate estate typical of a large academic or medical institution.

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

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS15164Unite Private Networks LLC.124
AS22645LEARN4

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 1 prefixes · 1.02K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America1

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS19321
Registry name
UMC-HEALTH-SYSTEM
Registrant
University Medical Center
Abuse contact
itinfrastructurenetwork@umchealthsystem.com
Registered
2010-07-30
Last changed
2012-02-24
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS19321
ASPA
no ASPA record
IRR
100% registered · 2 of 2 announcements
Route objects
2 naming AS19321

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

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 1,781 prefixes, as published 2026-10-16. 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

Cross-check