Autonomous System

AS4991 Cogent Communications, LLC

ISPActiveUnited StatesARIN

AS4991 (COGENT-4991-4994) is an ISP network operated by Cogent Communications, LLC in United States, registered with ARIN. It has 1 IPv4 prefix with 16,384 addresses, which makes it the 7,714th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses16,384in 1 prefix
IPv6 prefixes0none
Size rank#7,714of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationCogent Communications, LLC
AS nameCOGENT-4991-4994
Websitecogentco.com
Country United States (US)
Network typeISP
RegistryARIN
Abuse contact—
Registered1995-05-31
Last updated2025-09-23

IPv4 prefixes

1 prefix · 16,384 addresses
NetworkAddressesFirst – last address
204.6.192.0/1816,384204.6.192.0 – 204.6.255.255

IPv6 prefixes

No IPv6 prefixes.

Query AS4991 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=AS4991&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS4991, with or without a key:

curl "https://api.ipapi.is/?q=204.6.192.1"

Other networks of Cogent Communications, LLC

AS174 Cogent Communications, LLC36,828,160 IPv4 addresses

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