Autonomous System

AS23028 Team Cymru Inc.

BusinessActiveUnited StatesARIN

AS23028 (TEAM-CYMRU) is a business network operated by Team Cymru Inc. in United States, registered with ARIN. It has 30 IPv4 prefixes with 23,808 addresses and 16 IPv6 prefixes, which makes it the 6,209th largest of 82,283 active autonomous systems by IPv4 space.

IPv4 addresses23,808in 30 prefixes
IPv6 prefixes16≈ 7.9 × 10²⁸ addresses
Size rank#6,209of 82,283 active ASNs
Abuser scoreVery Low0.03% of its addresses flagged · method

Details

OrganizationTeam Cymru Inc.
AS nameTEAM-CYMRU
Websiteteam-cymru.com
Country United States (US)
Network typeBusiness
RegistryARIN
Abuse contactpeering@cymru.com
Registered2002-01-04
Last updated2026-09-04

IPv4 prefixes

30 prefixes · 23,808 addresses
NetworkAddressesFirst – last address
216.31.0.0/1816,384216.31.0.0 – 216.31.63.255
38.229.33.0/2425638.229.33.0 – 38.229.33.255
38.229.252.0/2425638.229.252.0 – 38.229.252.255
68.22.187.0/2425668.22.187.0 – 68.22.187.255
192.138.226.0/24256192.138.226.0 – 192.138.226.255
203.28.18.0/24256203.28.18.0 – 203.28.18.255
204.74.64.0/24256204.74.64.0 – 204.74.64.255
216.31.0.0/24256216.31.0.0 – 216.31.0.255
216.31.1.0/24256216.31.1.0 – 216.31.1.255
216.31.2.0/24256216.31.2.0 – 216.31.2.255
216.31.3.0/24256216.31.3.0 – 216.31.3.255
216.31.4.0/24256216.31.4.0 – 216.31.4.255
216.31.6.0/24256216.31.6.0 – 216.31.6.255
216.31.7.0/24256216.31.7.0 – 216.31.7.255
216.31.8.0/24256216.31.8.0 – 216.31.8.255
216.31.9.0/24256216.31.9.0 – 216.31.9.255
216.31.10.0/24256216.31.10.0 – 216.31.10.255
216.31.11.0/24256216.31.11.0 – 216.31.11.255
216.31.12.0/24256216.31.12.0 – 216.31.12.255
216.31.13.0/24256216.31.13.0 – 216.31.13.255
216.31.14.0/24256216.31.14.0 – 216.31.14.255
216.31.15.0/24256216.31.15.0 – 216.31.15.255
216.31.17.0/24256216.31.17.0 – 216.31.17.255
216.31.18.0/24256216.31.18.0 – 216.31.18.255
216.31.19.0/24256216.31.19.0 – 216.31.19.255
The 25 largest of 30. The API and the database have all of them.

IPv6 prefixes

16 prefixes
  • 2604:8800::/32
  • 2604:8800::/47
  • 2604:8800:50::/47
  • 2604:8800:20::/48
  • 2604:8800:52::/48
  • 2604:8800:53::/48
  • 2604:8800:60::/48
  • 2604:8800:64::/48
  • 2604:8800:65::/48
  • 2604:8800:66::/48
  • 2604:8800:67::/48
  • 2604:8800:68::/48
  • 2604:8800:69::/48
  • 2604:8800:70::/48
  • 2604:8800:71::/48
  • 2620:0:6b0::/48

Query AS23028 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS23028&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS23028, with or without a key:

curl "https://api.ipapi.is/?q=216.31.0.1"

Largest networks in United States

AS749 United States Department of Defense (DoD)227,398,912 IPv4 addressesAS16509 Amazon.com, Inc.218,475,264 IPv4 addressesAS7018 AT&T Enterprises, LLC117,261,568 IPv4 addressesAS8075 Microsoft Corporation81,463,040 IPv4 addressesAS721 United States Department of Defense (DoD)72,987,904 IPv4 addressesAS7922 Comcast Cable Communications, LLC68,337,152 IPv4 addresses