Autonomous System

AS33566 Knoxville Utilities Board

GovernmentActiveUnited StatesARIN

AS33566 (KUB-FIBER-01) is a government network operated by Knoxville Utilities Board in United States, registered with ARIN. It has 47 IPv4 prefixes with 52,224 addresses and 40 IPv6 prefixes, which makes it the 4,241st largest of 82,283 active autonomous systems by IPv4 space.

IPv4 addresses52,224in 47 prefixes
IPv6 prefixes40≈ 4.5 × 10²⁸ addresses
Size rank#4,241of 82,283 active ASNs
Abuser scoreVery Low0.04% of its addresses flagged · method

Details

OrganizationKnoxville Utilities Board
AS nameKUB-FIBER-01
Websitekub.org
Country United States (US)
Network typeGovernment
RegistryARIN
Abuse contactnoc@kub.org
Registered2012-07-24
Last updated2026-01-28

IPv4 prefixes

47 prefixes · 52,224 addresses
NetworkAddressesFirst – last address
162.81.16.0/204,096162.81.16.0 – 162.81.31.255
162.81.32.0/204,096162.81.32.0 – 162.81.47.255
162.81.48.0/204,096162.81.48.0 – 162.81.63.255
162.81.128.0/204,096162.81.128.0 – 162.81.143.255
162.81.208.0/204,096162.81.208.0 – 162.81.223.255
162.81.144.0/212,048162.81.144.0 – 162.81.151.255
162.81.152.0/212,048162.81.152.0 – 162.81.159.255
162.81.160.0/212,048162.81.160.0 – 162.81.167.255
162.81.168.0/212,048162.81.168.0 – 162.81.175.255
162.81.176.0/212,048162.81.176.0 – 162.81.183.255
162.81.184.0/212,048162.81.184.0 – 162.81.191.255
162.81.192.0/212,048162.81.192.0 – 162.81.199.255
162.81.200.0/212,048162.81.200.0 – 162.81.207.255
162.81.248.0/212,048162.81.248.0 – 162.81.255.255
162.81.12.0/221,024162.81.12.0 – 162.81.15.255
162.81.224.0/221,024162.81.224.0 – 162.81.227.255
162.81.228.0/221,024162.81.228.0 – 162.81.231.255
162.81.232.0/221,024162.81.232.0 – 162.81.235.255
162.81.240.0/221,024162.81.240.0 – 162.81.243.255
162.81.244.0/221,024162.81.244.0 – 162.81.247.255
162.81.6.0/23512162.81.6.0 – 162.81.7.255
162.81.0.0/24256162.81.0.0 – 162.81.0.255
162.81.8.0/24256162.81.8.0 – 162.81.8.255
162.81.70.0/24256162.81.70.0 – 162.81.70.255
162.81.100.0/24256162.81.100.0 – 162.81.100.255
The 25 largest of 47. The API and the database have all of them.

IPv6 prefixes

40 prefixes
  • 2606:83c0:1000::/36
  • 2606:83c0:2000::/37
  • 2606:83c0:3000::/37
  • 2606:83c0:8000::/37
  • 2606:83c0:9000::/37
  • 2606:83c0:9800::/37
  • 2606:83c0:a000::/37
  • 2606:83c0:a800::/37
  • 2606:83c0:b000::/37
  • 2606:83c0:b800::/37
  • 2606:83c0:c000::/37
  • 2606:83c0:c800::/37
  • 2606:83c0:d000::/37
  • 2606:83c0:e800::/37
  • 2606:83c0:c00::/38
  • 2606:83c0:6400::/40
  • 2606:83c0:6500::/40
  • 2606:83c0:6600::/40
  • 2606:83c0:6700::/40
  • 2606:83c0:6800::/40
  • 2606:83c0:6900::/40
  • 2606:83c0:6a00::/40
  • 2606:83c0:6b00::/40
  • 2606:83c0:6c00::/40
  • 2606:83c0:6d00::/40
The 25 largest of 40. The API and the database have all of them.

Query AS33566 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=AS33566&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS33566, with or without a key:

curl "https://api.ipapi.is/?q=162.81.16.1"

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