Autonomous system
AS23028 TEAM-CYMRU
Unclassified ARIN
Summary
Team Cymru
security research threat-intel business
TEAM-CYMRU is the autonomous system for Team Cymru Inc.
What it's used for
- The address space is primarily held by Team Cymru Inc., with netnames such as
TEAMC-1covering the majority of the inventory. - The AS announces 17664 IPv4 addresses and 36 IPv6 prefixes, maintaining 87 observed neighbours, a ratio consistent with a research and threat intelligence network rather than a transit provider.
Notable
- Registrants for the largest prefixes are Team Cymru Inc., while smaller blocks like
38.229.33.0/24are registered to Cogent Communications, LLC, and192.138.226.0/24to Computer Systems Consulting Services. - The address inventory is dominated by the
216.31.0.0/20range, with additional space in38.229.0.0/16and68.22.0.0/16.
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 4 exchanges in 4 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| IX.br (PTT.br) São Paulo | São Paulo, Brazil | 187.16.208.118 |
| LINX LON1 | London, United Kingdom | 195.66.225.217 |
| AMS-IX Amsterdam | Amsterdam, Netherlands | 80.249.214.224 |
| Rwanda Internet exchange | Kigali, Rwanda | 196.223.12.29 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 17.92K addresses IPv6 41 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 48 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS23028- Registry name
- TEAM-CYMRU
- Registrant
- Team Cymru Inc.
- Abuse contact
- peering@cymru.com
- Registered
- 2002-01-04
- Last changed
- 2026-09-04
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 2% valid · 1 valid, 43 with no ROA
- ROAs
- 5 authorising AS23028
- ASPA
- 9 declared providers
- IRR
- 100% registered · 44 of 44 announcements
- Route objects
- 23 naming AS23028
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: 436 networks and 1,771 prefixes, as published 2026-10-13. 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