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

AS174 · COGENT

Cogent/PSI

AS174 is operated by Cogent/PSI and serves as a Tier-1 transit provider, based in the United States since 2004. The system announces a whopping 36.2 million IPv4 addresses (0.98% of routable IPv4 space), including a /8, and supports IPv6. Its primary geographic footprint is in the United States, with additional presence in the United Kingdom and Australia, and smaller footprints in 78 additional countries. This AS has recently updated its prefix announcements.

  • 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
  • #4 by Degree — Top 100 by unique BGP neighbor count
  • #2 in United States — Top 10 by reach within country

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 13, 2004
Last Changed
May 10, 2026
Last Seen
August 06, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
3 797 / 690
IPv6 Prefixes (raw / aggregated)
446 / 36
IPv4 Addresses
36 204 544
Largest IPv4 Prefix
/8 (16 777 216 addresses)
Largest IPv6 Prefix
/28
Geolocated Countries
🇺🇸 United States (59 399 040 IPs), 🇬🇧 United Kingdom (753 008 IPs), 🇦🇺 Australia (430 912 IPs) and 78 more
Prefix Changed
August 07, 2026

Reputation

Reputation
Good — 114 flagged IPs out of 36 204 544 total (0.00%)
Open Proxies
5 known open proxies in this network

Connectivity Summary

Peers
88 networks exchanging traffic without transit
Downstream Customers
6 496 downstreams buying transit
Unclassified
138 unclassified BGP neighbors
Degree
6 722 unique BGP neighbors
Reach
70 111 networks in customer cone

Prefix Lists

IPv4 Prefixes (3 797 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))
  • 154.24.0.0/13 (524 288 addresses (/13 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))
  • 154.36.0.0/14 (262 144 addresses (/14 prefix))
  • 205.160.0.0/14 (262 144 addresses (/14 prefix))
  • 206.228.0.0/14 (262 144 addresses (/14 prefix))
  • 206.104.0.0/14 (262 144 addresses (/14 prefix))
  • 204.4.0.0/14 (262 144 addresses (/14 prefix))
  • 206.4.0.0/14 (262 144 addresses (/14 prefix))
  • 206.232.0.0/14 (262 144 addresses (/14 prefix))
  • 65.168.0.0/14 (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))
  • 204.248.0.0/14 (262 144 addresses (/14 prefix))
  • 204.240.0.0/14 (262 144 addresses (/14 prefix))
  • 204.212.0.0/14 (262 144 addresses (/14 prefix))
  • 204.204.0.0/14 (262 144 addresses (/14 prefix))
  • 204.180.0.0/14 (262 144 addresses (/14 prefix))
  • 207.40.0.0/14 (262 144 addresses (/14 prefix))
  • 208.32.0.0/14 (262 144 addresses (/14 prefix))
  • 199.0.0.0/14 (262 144 addresses (/14 prefix))
  • 204.96.0.0/15 (131 072 addresses (/15 prefix))
  • 199.98.0.0/15 (131 072 addresses (/15 prefix))
  • 204.94.0.0/15 (131 072 addresses (/15 prefix))
  • 198.68.0.0/15 (131 072 addresses (/15 prefix))
  • 204.118.0.0/15 (131 072 addresses (/15 prefix))
  • 205.198.0.0/15 (131 072 addresses (/15 prefix))
  • 206.0.0.0/15 (131 072 addresses (/15 prefix))
  • 206.84.0.0/15 (131 072 addresses (/15 prefix))
  • 206.148.0.0/15 (131 072 addresses (/15 prefix))
  • 154.22.0.0/15 (131 072 addresses (/15 prefix))
  • 154.18.0.0/15 (131 072 addresses (/15 prefix))
  • 154.12.0.0/15 (131 072 addresses (/15 prefix))
  • 206.158.0.0/15 (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))
  • 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))
  • 65.172.0.0/15 (131 072 addresses (/15 prefix))
  • 206.236.0.0/15 (131 072 addresses (/15 prefix))
  • 216.28.0.0/15 (131 072 addresses (/15 prefix))

IPv6 Prefixes (446 total)

  • 2600::/28
  • 2a06:f980::/29
  • 2a0e:78c0::/29
  • 2a0e:a944::/30
  • 2a0f:3b80::/30
  • 2c0f:e9a0::/32
  • 2001:978::/32
  • 2a0c:9e06::/32
  • 2a02:bf8::/32
  • 2001:550::/32
  • 2605:6900::/32
  • 2605:a680::/32
  • 2804:5330::/32
  • 2402:4480::/32
  • 2403:a800::/32
  • 2a14:7584:f000::/36
  • 2602:f7e1::/36
  • 2602:ffb6::/36
  • 2602:fd2e::/36
  • 2a05:7640:2040::/42
  • 2a05:7640:2090::/44
  • 2a05:7640:20d0::/44
  • 2a05:7640:2140::/44
  • 2a0f:cac0:2::/47
  • 2a0f:cac0:4::/47
  • 2604:7580:8::/48
  • 2a03:f80:420::/48
  • 2a01:4ce0:50::/48
  • 2620:17b:4::/48
  • 2a0e:b107:5c8::/48
  • 2620:9c:6000::/48
  • 2607:f710:200::/48
  • 2607:f710:72::/48
  • 2a13:9500:14f::/48
  • 2607:f710:36::/48
  • 2602:fc39:1::/48