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

AS174 · COGENT-174

Cogent Communications LLC

AS174 is operated by Cogent Communications LLC and serves as a Tier-1 transit provider, based in the United States since 1996. The system announces a whopping 36.3 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 Canada and Venezuela, and smaller footprints in 111 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
  • #4 by Reach — Top 100 by customer cone size
  • #5 by Degree — Top 100 by unique BGP neighbor count
  • #3 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
October 01, 2026
Last Seen
October 10, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
3 941 / 728
IPv6 Prefixes (raw / aggregated)
451 / 36
IPv4 Addresses
36 337 152
Largest IPv4 Prefix
/8 (16 777 216 addresses)
Largest IPv6 Prefix
/28
Geolocated Countries
🇺🇸 United States (31 914 336 IPs), 🇨🇦 Canada (774 928 IPs), 🇻🇪 Venezuela (476 160 IPs) and 111 more
Prefix Changed
October 11, 2026

Reputation

Reputation
Good — 110 flagged IPs out of 36 337 152 total (0.00%)
Open Proxies
2 known open proxies in this network

Connectivity Summary

Peers
85 networks exchanging traffic without transit
Downstream Customers
6 472 downstreams buying transit
Unclassified
134 unclassified BGP neighbors
Degree
6 691 unique BGP neighbors
Reach
41 361 networks in customer cone

Prefix Lists

IPv4 Prefixes (3 941 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))
  • 154.24.0.0/13 (524 288 addresses (/13 prefix))
  • 154.40.0.0/13 (524 288 addresses (/13 prefix))
  • 205.240.0.0/13 (524 288 addresses (/13 prefix))
  • 65.168.0.0/14 (262 144 addresses (/14 prefix))
  • 149.92.0.0/14 (262 144 addresses (/14 prefix))
  • 154.36.0.0/14 (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))
  • 204.180.0.0/14 (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))
  • 205.160.0.0/14 (262 144 addresses (/14 prefix))
  • 206.4.0.0/14 (262 144 addresses (/14 prefix))
  • 206.104.0.0/14 (262 144 addresses (/14 prefix))
  • 206.228.0.0/14 (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))
  • 207.40.0.0/14 (262 144 addresses (/14 prefix))
  • 208.32.0.0/14 (262 144 addresses (/14 prefix))
  • 65.172.0.0/15 (131 072 addresses (/15 prefix))
  • 144.228.0.0/15 (131 072 addresses (/15 prefix))
  • 149.6.0.0/15 (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))
  • 149.50.0.0/15 (131 072 addresses (/15 prefix))
  • 149.52.0.0/15 (131 072 addresses (/15 prefix))
  • 149.66.0.0/15 (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))
  • 154.18.0.0/15 (131 072 addresses (/15 prefix))
  • 154.22.0.0/15 (131 072 addresses (/15 prefix))
  • 198.68.0.0/15 (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))
  • 204.96.0.0/15 (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))
  • 206.158.0.0/15 (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 (451 total)

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