Autonomous system
AS11164 INTERNET2-I2PX
Education ARIN Educational/Research
Summary
Internet2 (I2PX)
research education transit legacy
INTERNET2-I2PX is the peering AS of Internet2, the US national research-and-education backbone. I2PX (the Internet2 Peer Exchange, the successor to what was long called TransitRail/CPS) is the AS Internet2 uses to hold commercial peering sessions with content and cloud providers and hand those routes on to its member universities, labs and regional networks.
What it's used for
Backbone plumbing and route exchange, not end-user address space. RIS sees 7 IPv4 prefixes / 2,048 addresses and 7 IPv6 prefixes, against 95 observed neighbours. That ratio is the whole story: a network with only a couple of thousand addresses that nonetheless talks BGP with ~95 other autonomous systems is doing exchange work, not serving customers on those addresses. The addresses themselves are router infrastructure.
Notable
The reverse DNS confirms it directly. Sampled PTRs land on names like lo-7.core1.ashb.net.internet2.edu, core1.seat, core1.losa and core2.newy32aoa — loopbacks and core-router interfaces in Ashburn, Seattle, Los Angeles and 32 Avenue of the Americas in New York, all under Internet2's own domain. Every announced prefix is registered to Internet2 (INTERNET2, I2-NEWNET), so holder, registrant and rDNS all agree.
Interesting
Internet2's main backbone rides a different AS number; this one exists so that commercial peering can be kept on a separate policy boundary from R&E transit, which is why the address footprint is tiny and the neighbour count is not.
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 14 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Equinix Internet Exchange Ashburn | Ashburn, United States | 206.126.236.45 |
| Seattle Internet Exchange | Seattle, United States | 206.81.80.77 |
| Coresite - Any2 West | Los Angeles, United States | 206.72.210.14 |
| Any2 California | Los Angeles, United States | 206.72.210.14 |
| DE-CIX New York | New York, United States | 206.82.104.148 |
| Equinix Internet Exchange Chicago | Chicago, United States | 208.115.136.116 |
| Equinix Internet Exchange Dallas | Dallas, United States | 206.223.118.32 |
| New York International Internet Exchange | New York, United States | 2001:504:1::a501:1164:1 |
Transit providers
9 upstream, 151 downstream and 252 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 8 prefixes · 2.30K addresses IPv6 7 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 15 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11164- Registry name
- INTERNET2-I2PX
- Registrant
- Internet2
- Abuse contact
- abuse@net.internet2.edu
- Registered
- 2014-07-11
- Last changed
- 2020-04-27
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- Internet2 I2PX
- Also known as
- Internet2 TransitRail / TR-CPS
- Network type
- Educational/Research
- Scope
- North America
- Traffic ratio
- Mostly Inbound
- Peering policy
- Selective
- IRR as-set
RADB::AS11164:AS-ALL- Present at
- 11 exchanges
- Facilities
- 9 facilities
- Website
- https://www.internet2.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 · 26 valid, 0 with no ROA
- ROAs
- 38 authorising AS11164
- ASPA
- no ASPA record
- IRR
- 81% registered · 21 of 26 announcements 5 other origin
- Route objects
- 27 naming AS11164
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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