AS3257GTT Communications Inc.

United StatesRegistryRIPE NCCTypeT1

As of 26th September 2026, AS3257 (GTT Communications Inc.), a tier-1 transit network registered in the United States with RIPE NCC, originates 1,799 IPv4 prefixes covering 9.2M addresses and 85 IPv6 prefixes. By IPv4 address space that makes it the 75th-largest of the 79,480 networks we see originating IPv4, and the 24th-largest of 18,421 in the United States. It is seen behind 71 upstream networks, most often AS398465 (Rackdog LLC) and AS6667 (Elisa Oyj), and in front of 1,834 downstream networks. 50% of its announcements have a valid RPKI ROA; 135 are RPKI-invalid. 90% of its routes reach at least 90% of full-feed peers, and 36 prefixes are also originated by another network.

At a glance

IPv4 prefixes

1,799

IPv6 prefixes

IPv4 addresses

9.2M

IPv6 /64s

443B

Upstream graph

The networks AS3257 is seen behind, one and two hops out, drawn from real AS paths.

AS3257Toward the internet core

Networks observed one and two hops upstream of AS3257 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

3,758

adjacent networks

Upstreams: 712%
Peers: 1,85349%
Downstreams: 1,83449%

Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 71.

Upstreams of AS3257
Network	Country	Relationship	Paths	Vantage pts
AS398465Rackdog LLC	US	Peer	1,055,784	6
AS6667Elisa Oyj	FI	Peer	411,897	4
AS16552Tiggee LLC	US	Peer	367,920	4
AS2497Internet Initiative Japan Inc.	JP	Peer	341,970	6
AS9002RETN Limited	GB	Peer	330,835	28
AS1299Arelion (fka. Telia Carrier)	SE	Peer	226,675	49
AS3356Lumen (Level 3)	US	Peer	217,339	47
AS2914NTT America, Inc.	US	Peer	215,044	47
AS3491PCCW Global (HK) Ltd.	HK	Peer	214,647	33
AS58511Swoop (Anycast Global Backbone)	AU	Peer	187,964	2

Prefixes

All 1,884

The largest blocks AS3257 originates, widest first.

Largest prefixes originated by AS3257
Prefix	Addresses	Visibility
67.100.0.0/14	262k	80/81
68.164.0.0/14	262k	80/81
87.84.0.0/14	262k	80/81
217.204.0.0/14	262k	80/81
64.204.0.0/15	131k	80/81
64.248.0.0/15	131k	80/81
65.84.0.0/15	131k	80/81
66.92.0.0/15	131k	80/81
66.166.0.0/15	131k	80/81
72.244.0.0/15	131k	80/81

Routing health

How AS3257'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

Valid49.6%935
Invalid7.2%135
No ROA43.2%814

Propagation

Globally propagated90% of full-feed peers or more90.4%1,704
Partially propagated40% to 90%0.6%11
Seen by few peersUnder 40%9.0%169

Prefix sizes

IPv4 — 1,799 prefixes

IPv6 — 85 prefixes

/2934.4B × /649.4%8
/3017.2B × /642.4%2
/324.3B × /6436.5%31
/36268M × /641.2%1
/3867.1M × /641.2%1
/3933.6M × /642.4%2
/46262k × /641.2%1
/4865.5k × /6427.1%23
/49 and longerAggregated18.8%16

Recent changes

Announcements that started or stopped since 27th Aug 2026.

Announced107.158.76.0/2425th Sept 2026
Announced173.232.180.0/2425th Sept 2026
Withdrawn176.126.77.0/2425th Sept 2026
Withdrawn185.201.224.0/2425th Sept 2026
Withdrawn185.232.6.0/2325th Sept 2026
Withdrawn185.239.212.0/2225th Sept 2026
Withdrawn195.16.64.0/2225th Sept 2026
Withdrawn2.56.236.0/2225th Sept 2026
Withdrawn2.58.75.0/2425th Sept 2026
Withdrawn45.8.164.0/2225th Sept 2026
Withdrawn85.190.255.0/2425th Sept 2026
Announced155.229.198.0/2424th Sept 2026

415 announced and 22 withdrawn in all; the most recent are shown.

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