Autonomous system
AS55 UPENN
Unclassified ARIN Educational/Research
Summary
University of Pennsylvania
education research university legacy
An early low-numbered allocation (UPENN) serving the University of Pennsylvania in Philadelphia.
What it's used for
- Campus, research, and administrative networking for Penn and its schools.
Notable
- Institutional address space, not commercial hosting.
- A two-digit AS number places Penn among the internet's earliest participants.
Interesting
- ENIAC, one of the first general-purpose electronic computers, was built at the University of Pennsylvania in the 1940s.
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 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 11 prefixes · 262K addresses IPv6 16 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 27 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS55- Registry name
- UPENN
- Registrant
- University of Pennsylvania
- Abuse contact
- security@upenn.edu
- Registered
- 1985-12-18
- Last changed
- 2021-10-14
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- UPENN
- Also known as
- Penn
- Network type
- Educational/Research
- Scope
- North America
- Traffic ratio
- Not Disclosed
- Peering policy
- Selective
- Facilities
- 1 facilities
- Website
- https://www.upenn.edu
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 100% valid · 6 valid, 0 with no ROA
- ROAs
- 7 authorising AS55
- ASPA
- no ASPA record
- IRR
- 100% registered · 6 of 6 announcements
- Route objects
- 7 naming AS55
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: 448 networks and 1,851 prefixes, as published 2026-10-29. 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