Autonomous system
AS5050 PSC-EXT
Education ARIN Educational/Research
Summary
Pittsburgh Supercomputing Center
education research legacy
PSC-EXT — the external-facing network of the Pittsburgh Supercomputing Center (PSC), a high-performance computing and networking center founded in 1986 as a joint effort of Carnegie Mellon University and the University of Pittsburgh.
What it's used for
- Connecting PSC's supercomputing systems and their research users to the wider internet.
- Serving 3ROX, the Three Rivers Optical Exchange — the regional aggregation point PSC operates for research and education sites across western and central Pennsylvania and West Virginia. Members include Carnegie Mellon, Penn State, the University of Pittsburgh, West Virginia University, and WVNet.
Notable
- Research-and-education address space: about 59,000 addresses supporting scientific computing and a regional REN, not commercial customers.
- 3ROX carries both commodity internet and research paths, including a 100 Gbps connection to Internet2.
- Its parent institution Carnegie Mellon holds the single-digit AS9.
Interesting
- PSC was one of the original five NSF supercomputing centers, the program that seeded NSFNET and, with it, much of the early commodity internet. ARIN registered AS5050 in 1995.
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
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Pittsburgh Internet Exchange | Pittsburgh, United States | 206.71.141.50 |
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
IPv4 11 prefixes · 58.88K addresses IPv6 2 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 13 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5050- Registry name
- PSC-EXT
- Registrant
- Pittsburgh Supercomputing Center
- Abuse contact
- pscnet-admin@psc.edu
- Registered
- 1995-03-29
- Last changed
- 2012-04-02
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- 3ROX (Three Rivers Optical Exchange)
- Also known as
- Pittsburgh Supercomputing Center
- Network type
- Educational/Research
- Scope
- Regional
- Traffic ratio
- Mostly Inbound
- Peering policy
- Selective
- IRR as-set
AS5050:AS-ALL- Present at
- 1 exchanges
- Facilities
- 1 facilities
- Website
- https://www.3rox.net
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
- 68% valid · 13 valid, 6 with no ROA
- ROAs
- 17 authorising AS5050
- ASPA
- no ASPA record
- IRR
- 100% registered · 19 of 19 announcements
- Route objects
- 31 naming AS5050
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: 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