asn.dev

Autonomous system

AS22644 TJUH

Unclassified ARIN

IPv4 addresses 61.44K 4 prefixes
IPv6 prefixes 11 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 4 0 downstream
Flagged prefixes 0 none

Summary

Thomas Jefferson University Hospitals

United States of America · AI-generated

healthcare university business internal

The AS handle TJUH is held by Thomas Jefferson University Hospitals, Inc.

What it's used for

  • The address space carries internal corporate infrastructure for a major academic medical center, evidenced by netnames TJU and registrants Thomas Jefferson University across all announced IPv4 prefixes.
  • The AS announces 61,440 IPv4 addresses and 11 IPv6 prefixes while maintaining only 4 observed neighbours, a ratio that indicates an internal corporate estate with site-by-site segmentation rather than an access or transit network.

Notable

  • All RDAP registrants for the largest prefixes are Thomas Jefferson University, which aligns with the registry holder Thomas Jefferson University Hospitals, Inc.
  • In 2014, Jefferson Health System was dissolved, and Thomas Jefferson University Hospitals rebranded as Jefferson Health, the current multi-state non-profit health system.
  • The IPv4 inventory consists of four contiguous blocks within the 147.140.0.0/16 range, while the IPv6 inventory is finely subdivided into ten distinct prefixes under the 2605:2c0::/32 space.

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

4 upstream, 0 downstream and 6 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS46887Crown Castle Fiber LLC591
AS399855Keystone REN, LLC272
AS174Cogent Communications, LLC4
AS33659Comcast Cable Communications, LLC1

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-18, 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 4 prefixes · 61.44K addresses IPv6 11 prefixes

CountryNamePrefixes
USUnited States of America15

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS22644
Registry name
TJUH
Registrant
Thomas Jefferson University Hospitals, Inc.
Abuse contact
abuse@jefferson.edu
Registered
2001-10-29
Last changed
2022-03-29
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 22 valid, 0 with no ROA
ROAs
2 authorising AS22644
ASPA
no ASPA record
IRR
100% registered · 22 of 22 announcements
Route objects
10 naming AS22644

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 1,784 prefixes, as published 2026-10-19. 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