Autonomous system
AS174 COGENT-174
Transit DROP-listed space ARIN NSP
Summary
Cogent Communications
transit tier-1 backbone
Cogent is a large, low-cost Tier 1 IP transit provider with an extensive international backbone, popular with data centers and hosting providers.
What it's used for
- Wholesale IP transit and dedicated internet access, often priced aggressively per megabit.
- Backbone connectivity into thousands of carrier-neutral data centers where Cogent has a presence.
Notable
- Cogent has a long history of peering disputes (notably with other Tier 1s and large content networks), which have periodically caused partial reachability problems between Cogent-only and rival-only customers.
- A very low AS number (174) reflects its roots in early internet registration.
Interesting
- Cogent grew largely by acquiring the assets of failed dot-com-era carriers, assembling a global network at bargain prices.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
Recorded at 2 exchanges in 2 countries, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Milan Internet Exchange | Milan, Italy | 2001:7f8:b:100:1d1:a5d0:174:14 |
| CERN IXP / Equinix Internet Exchange Geneva | Geneva, Switzerland | 192.65.185.237 |
Transit providers
58 upstream, 6,422 downstream and 6,449 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-10, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 9,896 prefixes · 24.66M addresses IPv6 1,373 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 11,269 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS174- Registry name
- COGENT-174
- Registrant
- Cogent Communications, LLC
- Abuse contact
- abuse@cogentco.com
- Registered
- 1996-05-16
- Last changed
- 2012-03-02
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- Cogent Communications, Inc.
- Network type
- NSP
- Scope
- Global
- Peering policy
- No
- Facilities
- 816 facilities
- Website
- http://www.cogentco.com/
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 10% valid · 449 valid, 4,005 with no ROA 17 RPKI-invalid
- ROAs
- 1,579 authorising AS174
- ASPA
- 1 declared providers
- IRR
- 81% registered · 3,610 of 4,471 announcements 98 other origin
- Route objects
- 2,234 naming AS174
Reputation
Classification and threat
Transit Tier-1 or major backbone carrying other networks’ traffic.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
6 DROP matches Announced space overlapping the DROP prefix list.
| Announced | DROP entry | Record |
|---|---|---|
| 38.92.176.0/20 | 38.92.184.0/21 | SBL683356 |
| 38.107.120.0/21 | 38.107.120.0/21 | SBL693166 |
| 65.166.248.0/21 | 65.166.249.0/24 | SBL694571 |
| 102.129.152.0/23 | 102.129.152.0/24 | SBL696940 |
| 191.101.31.0/24 | 191.101.31.0/24 | SBL692717 |
| 199.1.24.0/21 | 199.1.24.0/21 | SBL679509 |
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 431 networks and 1,775 prefixes, as published 2026-10-11. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere