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AS174 COGENT-174 - Cogent Communications, LLC

Everything the routing table and the registries say about AS174: who holds it, which registry issued it, and which address blocks it advertises.

Transit and backboneAS174

4027 IPv4 and 528 IPv6 prefixes announced.

Registry facts

Refreshed daily
AS number
AS174
Holder
COGENT-174 - Cogent Communications, LLC
Country
US
Regional registry
ARIN — American Registry for Internet Numbers
Registry block
1-1876 (IANA 16-bit Autonomous System (AS) Numbers Registry)
Announced today
Yes
IPv4 prefixes
4027
IPv6 prefixes
528
Observed at
2026-09-05T16:00:00

Data: RIPEstat. Prefix and holder data comes from the RIPEstat Data API and is cached for 24 hours. The regional registry is derived from the IANA AS number allocation table. Authoritative registry records are served by ARIN RDAP.

Announced prefixes

4027 IPv4 · 528 IPv6
  • 100 IPv4 shown
  • 100 IPv6 shown
  • 2.58.4.0/22
  • 5.83.219.0/24
  • 5.157.72.0/21
  • 8.24.64.0/23
  • 8.24.72.0/23
  • 16.5.168.0/23
  • 16.5.170.0/23
  • 23.26.130.0/24
  • 23.135.116.0/24
  • 23.135.124.0/24
  • 23.141.196.0/24
  • 23.141.204.0/24
  • 23.141.212.0/24
  • 23.141.228.0/24
  • 23.142.100.0/24
  • 23.144.28.0/24
  • 23.144.60.0/24
  • 23.146.76.0/24
  • 23.146.116.0/24
  • 23.148.44.0/24
  • 23.148.60.0/24
  • 23.148.68.0/24
  • 23.148.92.0/24
  • 23.148.116.0/24
  • 23.148.124.0/24
  • 23.148.164.0/24
  • 23.151.196.0/24
  • 23.161.96.0/24
  • 23.227.92.0/22
  • 23.234.144.0/22
  • 23.237.93.0/24
  • 37.34.88.0/21
  • 37.49.150.0/24
  • 38.0.0.0/8
  • 38.3.128.0/24
  • 38.3.180.0/24
  • 38.3.181.0/24
  • 38.3.182.0/24
  • 38.3.183.0/24
  • 38.5.16.0/24
  • 38.7.64.0/20
  • 38.7.96.0/24
  • 38.7.97.0/24
  • 38.9.32.0/24
  • 38.9.40.0/22
  • 38.9.40.0/24
  • 38.9.41.0/24
  • 38.9.42.0/24
  • 38.9.43.0/24
  • 38.10.160.0/24
  • 38.10.161.0/24
  • 38.10.162.0/24
  • 38.10.163.0/24
  • 38.10.164.0/24
  • 38.10.165.0/24
  • 38.10.166.0/24
  • 38.10.167.0/24
  • 38.10.168.0/24
  • 38.10.169.0/24
  • 38.10.170.0/24
  • 38.10.171.0/24
  • 38.10.172.0/24
  • 38.10.173.0/24
  • 38.10.174.0/24
  • 38.10.175.0/24
  • 38.15.0.0/19
  • 38.15.184.0/21
  • 38.17.40.0/23
  • 38.17.42.0/23
  • 38.18.160.0/19
  • 38.18.236.0/22
  • 38.19.12.0/24
  • 38.19.48.0/24
  • 38.19.172.0/22
  • 38.19.192.0/24
  • 38.19.193.0/24
  • 38.19.194.0/24
  • 38.19.195.0/24
  • 38.19.198.0/24
  • 38.19.214.0/24
  • 38.19.224.0/23
  • 38.19.224.0/24
  • 38.19.225.0/24
  • 38.19.226.0/24
  • 38.19.234.0/23
  • 38.19.234.0/24
  • 38.19.235.0/24
  • 38.19.236.0/24
  • 38.19.251.0/24
  • 38.20.12.0/24
  • 38.20.130.0/23
  • 38.20.138.0/24
  • 38.20.139.0/24
  • 38.20.160.0/20
  • 38.20.228.0/24
  • 38.21.64.0/24
  • 38.21.65.0/24
  • 38.21.66.0/24
  • 38.21.67.0/24
  • 38.22.9.0/24
  • 2001:550::/32
  • 2001:550:1:100::/56
  • 2001:550:1:300::/64
  • 2001:550:1:301::/64
  • 2001:550:1:304::/64
  • 2001:550:1:c::/64
  • 2001:550:100:8::/64
  • 2001:550:100:9::/64
  • 2001:550:104::/48
  • 2001:550:107::/48
  • 2001:550:108::/48
  • 2001:550:1100::/48
  • 2001:550:1200:1::/64
  • 2001:550:1200:3::/64
  • 2001:550:1202::/48
  • 2001:550:1202:1::/64
  • 2001:550:1204::/48
  • 2001:550:1205::/48
  • 2001:550:1207::/48
  • 2001:550:1208::/48
  • 2001:550:1303::/48
  • 2001:550:1304::/48
  • 2001:550:1305::/48
  • 2001:550:1401::/48
  • 2001:550:1504::/48
  • 2001:550:1505::/48
  • 2001:550:1506::/48
  • 2001:550:1507::/48
  • 2001:550:1602:1::/64
  • 2001:550:1602:2::/64
  • 2001:550:1606::/48
  • 2001:550:1607::/48
  • 2001:550:1609::/48
  • 2001:550:160a::/48
  • 2001:550:1700::/48
  • 2001:550:1801::/48
  • 2001:550:1802::/48
  • 2001:550:1804::/48
  • 2001:550:1805::/48
  • 2001:550:1900:1::/64
  • 2001:550:1901::/48
  • 2001:550:1905::/48
  • 2001:550:1b00::/48
  • 2001:550:1b05::/48
  • 2001:550:1b06::/48
  • 2001:550:1b07::/48
  • 2001:550:1b08::/48
  • 2001:550:1b09::/48
  • 2001:550:1b0b::/48
  • 2001:550:1d01::/48
  • 2001:550:1d02::/48
  • 2001:550:1d03::/48
  • 2001:550:1d04::/48
  • 2001:550:1d09::/48
  • 2001:550:1d0e::/48
  • 2001:550:1e00::/64
  • 2001:550:1e01::/48
  • 2001:550:2004::/48
  • 2001:550:2006::/48
  • 2001:550:2007::/48
  • 2001:550:201::/48
  • 2001:550:202::/48
  • 2001:550:203::/48
  • 2001:550:204::/48
  • 2001:550:205::/48
  • 2001:550:206::/48
  • 2001:550:209::/48
  • 2001:550:20a::/48
  • 2001:550:20b::/48
  • 2001:550:2101::/48
  • 2001:550:2103::/48
  • 2001:550:2108::/48
  • 2001:550:2109::/48
  • 2001:550:2201::/48
  • 2001:550:2203::/48
  • 2001:550:2205::/48
  • 2001:550:2206::/48
  • 2001:550:2207::/48
  • 2001:550:2208::/48
  • 2001:550:2209::/48
  • 2001:550:220a::/48
  • 2001:550:220b::/48
  • 2001:550:220c::/48
  • 2001:550:220e::/48
  • 2001:550:2211::/48
  • 2001:550:2212::/48
  • 2001:550:2217::/48
  • 2001:550:221a::/48
  • 2001:550:221c::/48
  • 2001:550:221d::/48
  • 2001:550:221e::/48
  • 2001:550:2301::/48
  • 2001:550:2500::/48
  • 2001:550:2502::/48
  • 2001:550:2503::/48
  • 2001:550:2600:100::/56
  • 2001:550:2601::/48
  • 2001:550:2602::/48
  • 2001:550:2604::/48
  • 2001:550:2605::/48

A prefix here is a block this AS was seen originating in BGP, not a block it is guaranteed to own. Announcement and allocation are different facts, and they disagree more often than people expect.

Registry record

arin
FieldValue
ASNumber174
ASNameCOGENT-174
ASHandle174
RegDate1996-05-16
Refhttps://rdap.arin.net/registry/autnum/174
sourceARIN
OrgAbuseHandleCOGEN-ARIN
OrgAbuseNameCogent Abuse
OrgAbusePhone+1-877-875-4311
OrgAbuseEmailabuse@cogentco.com
OrgAbuseRefhttps://rdap.arin.net/registry/entity/COGEN-ARIN
sourceARIN
OrgNOCHandleZC108-ARIN
OrgNOCNameCogent Communications
OrgNOCPhone+1-877-875-4311
OrgNOCEmailnoc@cogentco.com
OrgNOCRefhttps://rdap.arin.net/registry/entity/ZC108-ARIN
sourceARIN
OrgNameCogent Communications, LLC
OrgIdCOGC
Address2450 N Street NW
CityWashington
StateProvDC
PostalCode20037

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