$ query “AS174” --type=asn → 1 result(s)

AS174 · COGENT-174

Cogent Communications LLC

AS174 belongs to Cogent Communications LLC and is a Tier-1 transit provider, registered in the United States since 1996. The system announces a whopping 35.9 million IPv4 addresses (0.97% of routable IPv4 space), including a /8, and supports IPv6. The bulk of its IP address space is in the United States, with additional presence in the United Kingdom and Singapore, and smaller footprints in 76 additional countries. This AS's prefix announcements have been recently modified.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • Space Overlord — Over 10 million IPv4 addresses
  • #3 by Reach — Top 100 by customer cone size
  • #3 by Degree — Top 100 by unique BGP neighbor count
  • #2 in United States — Top 10 by reach within country
  • Pioneer — Registered before the year 2000

Basic Information

Country
🇺🇸 United States
Category
Internet Service Provider
Network Role
Tier-1 Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Registered
May 16, 1996
Last Changed
March 04, 2026
Last Seen
April 18, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
5 137 / 823
IPv6 Prefixes (raw / aggregated)
420 / 41
IPv4 Addresses
35 904 768
Largest IPv4 Prefix
/8 (16 777 216 addresses)
Largest IPv6 Prefix
/28
Geolocated Countries
🇺🇸 United States (59 154 624 IPs), 🇬🇧 United Kingdom (935 120 IPs), 🇸🇬 Singapore (550 096 IPs) and 76 more
Prefix Changed
April 18, 2026

Reputation

Reputation
Good — 256 flagged IPs out of 35 904 768 total (0.00%)
Open Proxies
4 known open proxies in this network

Connectivity Summary

Peers
92 networks exchanging traffic without transit
Downstream Customers
6 558 downstreams buying transit
Unclassified
183 unclassified BGP neighbors
Degree
6 833 unique BGP neighbors
Reach
65 769 networks in customer cone

Prefix Lists

IPv4 Prefixes (5 137 total)

  • 38.0.0.0/8 (16 777 216 addresses (/8 prefix))
  • 208.0.0.0/11 (2 097 152 addresses (/11 prefix))
  • 63.160.0.0/12 (1 048 576 addresses (/12 prefix))
  • 154.48.0.0/12 (1 048 576 addresses (/12 prefix))
  • 65.160.0.0/13 (524 288 addresses (/13 prefix))
  • 205.240.0.0/13 (524 288 addresses (/13 prefix))
  • 154.40.0.0/13 (524 288 addresses (/13 prefix))
  • 154.24.0.0/13 (524 288 addresses (/13 prefix))
  • 208.32.0.0/14 (262 144 addresses (/14 prefix))
  • 206.4.0.0/14 (262 144 addresses (/14 prefix))
  • 65.168.0.0/14 (262 144 addresses (/14 prefix))
  • 206.104.0.0/14 (262 144 addresses (/14 prefix))
  • 204.212.0.0/14 (262 144 addresses (/14 prefix))
  • 206.228.0.0/14 (262 144 addresses (/14 prefix))
  • 154.36.0.0/14 (262 144 addresses (/14 prefix))
  • 206.232.0.0/14 (262 144 addresses (/14 prefix))
  • 207.12.0.0/14 (262 144 addresses (/14 prefix))
  • 149.92.0.0/14 (262 144 addresses (/14 prefix))
  • 199.0.0.0/14 (262 144 addresses (/14 prefix))
  • 207.40.0.0/14 (262 144 addresses (/14 prefix))
  • 204.4.0.0/14 (262 144 addresses (/14 prefix))
  • 205.160.0.0/14 (262 144 addresses (/14 prefix))
  • 204.248.0.0/14 (262 144 addresses (/14 prefix))
  • 204.240.0.0/14 (262 144 addresses (/14 prefix))
  • 204.180.0.0/14 (262 144 addresses (/14 prefix))
  • 154.22.0.0/15 (131 072 addresses (/15 prefix))
  • 204.118.0.0/15 (131 072 addresses (/15 prefix))
  • 204.96.0.0/15 (131 072 addresses (/15 prefix))
  • 204.94.0.0/15 (131 072 addresses (/15 prefix))
  • 205.198.0.0/15 (131 072 addresses (/15 prefix))
  • 216.28.0.0/15 (131 072 addresses (/15 prefix))
  • 199.98.0.0/15 (131 072 addresses (/15 prefix))
  • 206.0.0.0/15 (131 072 addresses (/15 prefix))
  • 198.68.0.0/15 (131 072 addresses (/15 prefix))
  • 206.84.0.0/15 (131 072 addresses (/15 prefix))
  • 154.18.0.0/15 (131 072 addresses (/15 prefix))
  • 206.148.0.0/15 (131 072 addresses (/15 prefix))
  • 206.158.0.0/15 (131 072 addresses (/15 prefix))
  • 65.172.0.0/15 (131 072 addresses (/15 prefix))
  • 154.12.0.0/15 (131 072 addresses (/15 prefix))
  • 149.86.0.0/15 (131 072 addresses (/15 prefix))
  • 149.66.0.0/15 (131 072 addresses (/15 prefix))
  • 149.52.0.0/15 (131 072 addresses (/15 prefix))
  • 149.50.0.0/15 (131 072 addresses (/15 prefix))
  • 206.236.0.0/15 (131 072 addresses (/15 prefix))
  • 149.34.0.0/15 (131 072 addresses (/15 prefix))
  • 149.12.0.0/15 (131 072 addresses (/15 prefix))
  • 149.6.0.0/15 (131 072 addresses (/15 prefix))
  • 144.228.0.0/15 (131 072 addresses (/15 prefix))
  • 154.17.0.0/16 (65 536 addresses (/16 prefix))
  • and 773 more

IPv6 Prefixes (420 total)

  • 2600::/28
  • 2a06:f980::/29
  • 2a0e:78c0::/29
  • 2a0e:a944::/30
  • 2a0f:3b80::/30
  • 2605:a680::/32
  • 2c0f:e9a0::/32
  • 2a02:bf8::/32
  • 2001:550::/32
  • 2804:5330::/32
  • 2001:978::/32
  • 2605:6900::/32
  • 2a0c:9e06::/32
  • 2402:4480::/32
  • 2403:a800::/32
  • 2602:f7e1::/36
  • 2602:ffb6::/36
  • 2602:fd2e::/36
  • 2a14:7584:f000::/36
  • 2a05:7640:21c0::/42
  • 2a05:7640:2040::/42
  • 2a05:7640:20d0::/44
  • 2a05:7640:2140::/44
  • 2a05:7640:2090::/44
  • 2a0f:cac0:2::/47
  • 2a0f:cac0:4::/47
  • 2a01:4ce0:50::/48
  • 2a03:f80:420::/48
  • 2a01:e943::/48
  • 2620:17b:4::/48
  • 2a07:85c1::/48
  • 2620:bc:e000::/48
  • 2a0e:1c80:3::/48
  • 2620:9c:6000::/48
  • 2607:f710:200::/48
  • 2a0e:b107:5c8::/48
  • 2607:f710:72::/48
  • 2607:f710:36::/48
  • 2604:7580:8::/48
  • 2602:fc39:1::/48
  • 2001:49f0:d011::/48