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

AS174 — COGENT-174

Cogent Communications LLC

AS174 is a Tier-1 transit provider operated by Cogent Communications LLC, registered in the United States since 1996. The network announces a whopping 35.9 million IPv4 addresses (0.97% of routable IPv4 space), including a /8. Supports IPv6.

  • 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
March 04, 2026

Prefix Summary

IPv4 Prefixes (raw / aggregated)
5 241 / 862
IPv6 Prefixes (raw / aggregated)
422 / 42
IPv4 Addresses
35 911 680
Largest IPv4 Prefix
/8 (16 777 216 addresses)
Largest IPv6 Prefix
/28
Geolocated Countries
🇺🇸 US (1 058 IPs), 🇬🇧 GB (112 IPs), 🇧🇷 BR (30 IPs), 🇦🇺 AU, 🇰🇾 KY, 🇸🇬 SG, 🇪🇸 ES, 🇭🇰 HK, 🇫🇷 FR, 🇨🇱 CL, 🇨🇦 CA, 🇩🇪 DE, 🇳🇴 NO, 🇻🇪 VE and 58 more
Prefix Changed
March 04, 2026

Reputation

Reputation
Good — 364 flagged IPs out of 35 911 680 total (0.00%)
Open Proxies
2 known open proxies in this network

Connectivity Summary

Upstream Providers
0 upstream autonomous systems providing transit
Peers
100 autonomous systems exchanging traffic without transit fees
Downstream Customers
6 557 downstream autonomous systems buying transit
Degree
6 803 unique BGP neighbors (providers + customers + peers)
Reach
66 469 — customer cone size measuring network influence
Degree Rank
#3
Reach Rank
#3
Country Rank
#2

Prefix Lists

IPv4 Prefixes (5 241 total)

  • 38.0.0.0/8 (16 777 216 addresses)
  • 208.0.0.0/11 (2 097 152 addresses)
  • 63.160.0.0/12 (1 048 576 addresses)
  • 154.48.0.0/12 (1 048 576 addresses)
  • 65.160.0.0/13 (524 288 addresses)
  • 154.24.0.0/13 (524 288 addresses)
  • 154.40.0.0/13 (524 288 addresses)
  • 205.240.0.0/13 (524 288 addresses)
  • 65.168.0.0/14 (262 144 addresses)
  • 149.92.0.0/14 (262 144 addresses)
  • 154.36.0.0/14 (262 144 addresses)
  • 199.0.0.0/14 (262 144 addresses)
  • 204.4.0.0/14 (262 144 addresses)
  • 204.180.0.0/14 (262 144 addresses)
  • 204.212.0.0/14 (262 144 addresses)
  • 204.240.0.0/14 (262 144 addresses)
  • 204.248.0.0/14 (262 144 addresses)
  • 205.160.0.0/14 (262 144 addresses)
  • 206.4.0.0/14 (262 144 addresses)
  • 206.104.0.0/14 (262 144 addresses)
  • 206.228.0.0/14 (262 144 addresses)
  • 206.232.0.0/14 (262 144 addresses)
  • 207.12.0.0/14 (262 144 addresses)
  • 207.40.0.0/14 (262 144 addresses)
  • 208.32.0.0/14 (262 144 addresses)
  • 65.172.0.0/15 (131 072 addresses)
  • 144.228.0.0/15 (131 072 addresses)
  • 149.6.0.0/15 (131 072 addresses)
  • 149.12.0.0/15 (131 072 addresses)
  • 149.34.0.0/15 (131 072 addresses)
  • 149.50.0.0/15 (131 072 addresses)
  • 149.52.0.0/15 (131 072 addresses)
  • 149.66.0.0/15 (131 072 addresses)
  • 149.86.0.0/15 (131 072 addresses)
  • 154.12.0.0/15 (131 072 addresses)
  • 154.18.0.0/15 (131 072 addresses)
  • 154.22.0.0/15 (131 072 addresses)
  • 198.68.0.0/15 (131 072 addresses)
  • 199.98.0.0/15 (131 072 addresses)
  • 204.94.0.0/15 (131 072 addresses)
  • 204.96.0.0/15 (131 072 addresses)
  • 204.118.0.0/15 (131 072 addresses)
  • 205.198.0.0/15 (131 072 addresses)
  • 206.0.0.0/15 (131 072 addresses)
  • 206.84.0.0/15 (131 072 addresses)
  • 206.148.0.0/15 (131 072 addresses)
  • 206.158.0.0/15 (131 072 addresses)
  • 206.236.0.0/15 (131 072 addresses)
  • 216.28.0.0/15 (131 072 addresses)
  • 65.174.0.0/16 (65 536 addresses)

IPv6 Prefixes (422 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
  • 2607:5a80::/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
  • 2a05:7640:21c0::/42
  • 2a05:7640:2090::/44
  • 2a05:7640:20d0::/44
  • 2a05:7640:2140::/44
  • 2a0f:cac0:2::/47
  • 2a0f:cac0:4::/47
  • 2001:49f0:d011::/48
  • 2602:fc39:1::/48
  • 2604:7580:8::/48
  • 2607:f710:36::/48
  • 2607:f710:72::/48
  • 2607:f710:200::/48
  • 2620:9c:6000::/48
  • 2620:bc:e000::/48
  • 2620:17b:4::/48
  • 2a01:4ce0:50::/48
  • 2a01:e943::/48
  • 2a03:f80:420::/48
  • 2a07:85c1::/48
  • 2a0e:1c80:3::/48
  • 2a0e:b107:5c8::/48