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

AS174 · COGENT

Cogent/PSI

AS174 is owned by Cogent/PSI and is a Tier-1 transit provider, registered in the United States since 2004. The system announces a whopping 36.3 million IPv4 addresses (0.98% of routable IPv4 space), including a /8, and supports IPv6. Most of its address space is geolocated to the United States, with additional presence in the United Kingdom and Singapore, and smaller footprints in 78 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

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
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
4 162 / 827
IPv6 Prefixes (raw / aggregated)
430 / 37
IPv4 Addresses
36 261 632
Largest IPv4 Prefix
/8 (16 777 216 addresses)
Largest IPv6 Prefix
/28
Geolocated Countries
🇺🇸 United States (59 885 488 IPs), 🇬🇧 United Kingdom (796 368 IPs), 🇸🇬 Singapore (534 224 IPs) and 78 more
Prefix Changed
June 23, 2026

Reputation

Reputation
Good — 119 flagged IPs out of 36 261 632 total (0.00%)
Open Proxies
12 known open proxies in this network

Connectivity Summary

Peers
99 networks exchanging traffic without transit
Downstream Customers
6 578 downstreams buying transit
Unclassified
154 unclassified BGP neighbors
Degree
6 831 unique BGP neighbors
Reach
68 355 networks in customer cone

Prefix Lists

IPv4 Prefixes (4 162 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))
  • 154.40.0.0/13 (524 288 addresses (/13 prefix))
  • 205.240.0.0/13 (524 288 addresses (/13 prefix))
  • 65.160.0.0/13 (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))
  • 204.180.0.0/14 (262 144 addresses (/14 prefix))
  • 207.40.0.0/14 (262 144 addresses (/14 prefix))
  • 207.12.0.0/14 (262 144 addresses (/14 prefix))
  • 206.4.0.0/14 (262 144 addresses (/14 prefix))
  • 199.0.0.0/14 (262 144 addresses (/14 prefix))
  • 204.4.0.0/14 (262 144 addresses (/14 prefix))
  • 206.232.0.0/14 (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))
  • 204.204.0.0/14 (262 144 addresses (/14 prefix))
  • 204.212.0.0/14 (262 144 addresses (/14 prefix))
  • 204.240.0.0/14 (262 144 addresses (/14 prefix))
  • 204.248.0.0/14 (262 144 addresses (/14 prefix))
  • 206.104.0.0/14 (262 144 addresses (/14 prefix))
  • 205.160.0.0/14 (262 144 addresses (/14 prefix))
  • 149.92.0.0/14 (262 144 addresses (/14 prefix))
  • 65.168.0.0/14 (262 144 addresses (/14 prefix))
  • 65.172.0.0/15 (131 072 addresses (/15 prefix))
  • 198.68.0.0/15 (131 072 addresses (/15 prefix))
  • 144.228.0.0/15 (131 072 addresses (/15 prefix))
  • 206.0.0.0/15 (131 072 addresses (/15 prefix))
  • 149.6.0.0/15 (131 072 addresses (/15 prefix))
  • 205.198.0.0/15 (131 072 addresses (/15 prefix))
  • 149.12.0.0/15 (131 072 addresses (/15 prefix))
  • 149.34.0.0/15 (131 072 addresses (/15 prefix))
  • 206.84.0.0/15 (131 072 addresses (/15 prefix))
  • 149.50.0.0/15 (131 072 addresses (/15 prefix))
  • 206.148.0.0/15 (131 072 addresses (/15 prefix))
  • 149.52.0.0/15 (131 072 addresses (/15 prefix))
  • 206.158.0.0/15 (131 072 addresses (/15 prefix))
  • 149.66.0.0/15 (131 072 addresses (/15 prefix))
  • 216.28.0.0/15 (131 072 addresses (/15 prefix))
  • 149.86.0.0/15 (131 072 addresses (/15 prefix))
  • 154.12.0.0/15 (131 072 addresses (/15 prefix))
  • 204.118.0.0/15 (131 072 addresses (/15 prefix))
  • 154.18.0.0/15 (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))
  • 206.236.0.0/15 (131 072 addresses (/15 prefix))
  • 154.22.0.0/15 (131 072 addresses (/15 prefix))
  • 199.98.0.0/15 (131 072 addresses (/15 prefix))

IPv6 Prefixes (430 total)

  • 2600::/28
  • 2a06:f980::/29
  • 2a0e:78c0::/29
  • 2a0e:a944::/30
  • 2a0f:3b80::/30
  • 2c0f:e9a0::/32
  • 2402:4480::/32
  • 2a0c:9e06::/32
  • 2a02:bf8::/32
  • 2001:550::/32
  • 2605:6900::/32
  • 2605:a680::/32
  • 2001:978::/32
  • 2804:5330::/32
  • 2403:a800::/32
  • 2602:f7e1::/36
  • 2a14:7584:f000::/36
  • 2602:ffb6::/36
  • 2602:fd2e::/36
  • 2a05:7640:2040::/42
  • 2a05:7640:21c0::/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