subnet.im

AS174Cogent Communications, LLC

United StatesRegistryARINTypeT1

As of 10th November 2026, AS174 (Cogent Communications, LLC), a tier-1 transit network registered in the United States with ARIN, originates 4,163 IPv4 prefixes covering 37.8M addresses and 603 IPv6 prefixes. By IPv4 address space that makes it the 16th-largest of the 80,723 networks we see originating IPv4, and the 10th-largest of 18,750 in the United States. It is seen behind 134 upstream networks, most often AS1299 (Arelion (fka. Telia Carrier)) and AS151326 (DCConnect Communication Pte. Ltd.), and in front of 6,459 downstream networks. 7% of its announcements have a valid RPKI ROA; 112 are RPKI-invalid. 39% of its routes reach at least 90% of full-feed peers, and 234 prefixes are also originated by another network.

At a glance

IPv4 prefixes

4,163

IPv6 prefixes

603

IPv4 addresses

37.8M

IPv6 /64s

250B

Upstream graph

The networks AS174 is seen behind, one and two hops out, drawn from real AS paths.

AS174Toward the internet core
Upstream graph for AS174: 11 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS174Cogent Communicat…This networkAS1299Arelion (fka. Tel…AS3356Lumen (Level 3)AS6453TATA Communicatio…AS39122Blacknight Intern…AS151326DCConnect Communi…AS13030Init7 (Switzerlan…AS16552Tiggee LLCAS2914NTT America, Inc.AS3549Lumen (fka. Globa…AS8220COLTAS35280F5 Networks SARL

Networks observed one and two hops upstream of AS174 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.

Neighbouring networks

13,236

adjacent networks

Upstreams
1341%
Peers
6,64350%
Downstreams
6,45949%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 134.

Upstreams of AS174
NetworkCountryRelationshipPathsVantage pts
AS1299Arelion (fka. Telia Carrier)SEPeer821,04177
AS151326DCConnect Communication Pte. Ltd.SGPeer752,4441
AS6453TATA Communications (America) IncUSPeer637,08849
AS39122Blacknight Internet Solutions LimitedIEPeer497,0812
AS3356Lumen (Level 3)USPeer496,47690
AS3130RGnet OUEEPeer483,7021
AS7713PT Telkom Indonesia TbkIDPeer439,58511
AS3491PCCW Global (HK) Ltd.HKPeer380,18434
AS2497Internet Initiative Japan Inc.JPPeer356,3526
AS3170VeloxServ Communications LtdGBPeer305,0922

Prefixes

All 4,766

The largest blocks AS174 originates, widest first.

Largest prefixes originated by AS174
PrefixAddressesVisibility
38.0.0.0/816.8M74/76
208.0.0.0/112.1M74/76
63.160.0.0/121M74/76
154.48.0.0/121M74/76
65.160.0.0/13524k74/76
154.24.0.0/13524k74/76
154.40.0.0/13524k74/76
205.240.0.0/13524k74/76
65.168.0.0/14262k75/76
149.92.0.0/14262k75/76

Routing health

How AS174's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.

RPKI origin validation

  • Valid6.6%315
  • Invalid2.3%112
  • No ROA91.0%4,339

Propagation

  • Globally propagated90% of full-feed peers or more38.9%1,854
  • Partially propagated40% to 90%2.9%136
  • Seen by few peersUnder 40%58.2%2,776

Prefix sizes

IPv4 — 4,163 prefixes

IPv6 — 603 prefixes

  • /2868.7B × /640.2%1
  • /2934.4B × /640.5%3
  • /324.3B × /642.8%17
  • /332.1B × /640.3%2
  • /36268M × /640.7%4
  • /424.2M × /640.2%1
  • /441M × /640.5%3
  • /4865.5k × /6469.5%419
  • /49 and longerAggregated25.4%153

Recent changes

Announcements that started or stopped since 11th Oct 2026.

770 announced and 406 withdrawn in all; the most recent are shown.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.