AS3257GTT Communications Inc.
United StatesRegistryRIPE NCCTypeT1As of 10th November 2026, AS3257 (GTT Communications Inc.), a tier-1 transit network registered in the United States with RIPE NCC, originates 1,911 IPv4 prefixes covering 9.4M addresses and 85 IPv6 prefixes. By IPv4 address space that makes it the 73rd-largest of the 80,723 networks we see originating IPv4, and the 24th-largest of 18,750 in the United States. It is seen behind 75 upstream networks, most often AS398465 (Rackdog LLC) and AS6667 (Elisa Oyj), and in front of 1,866 downstream networks. 48% of its announcements have a valid RPKI ROA; 136 are RPKI-invalid. 90% of its routes reach at least 90% of full-feed peers, and 28 prefixes are also originated by another network.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS3257 is seen behind, one and two hops out, drawn from real AS paths.
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
3,820
adjacent networks
- Upstreams
- 752%
- Peers
- 1,87949%
- Downstreams
- 1,86649%
Networks carrying this one's traffic toward the rest of the internet. Listing the 40 seen on the most AS paths, of 75.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS398465Rackdog LLC | US | Peer | 1,062,290 | 1 |
| AS6667Elisa Oyj |  FI | Peer | 401,231 | 4 |
| AS2497Internet Initiative Japan Inc. |  JP | Peer | 349,429 | 6 |
| AS16552Tiggee LLC | US | Peer | 341,249 | 4 |
| AS9002RETN Limited |  GB | Peer | 287,734 | 31 |
| AS1299Arelion (fka. Telia Carrier) |  SE | Peer | 224,506 | 50 |
| AS3356Lumen (Level 3) | US | Peer | 224,397 | 52 |
| AS2914NTT America, Inc. | US | Peer | 217,779 | 54 |
| AS3491PCCW Global (HK) Ltd. |  HK | Peer | 212,641 | 31 |
| AS6453TATA Communications (America) Inc | US | Peer | 182,632 | 39 |
Prefixes
All 1,996The largest blocks AS3257 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 67.100.0.0/14 | 262k | 76/76 |
| 68.164.0.0/14 | 262k | 76/76 |
| 87.84.0.0/14 | 262k | 76/76 |
| 217.204.0.0/14 | 262k | 76/76 |
| 64.204.0.0/15 | 131k | 76/76 |
| 64.248.0.0/15 | 131k | 76/76 |
| 65.84.0.0/15 | 131k | 76/76 |
| 66.92.0.0/15 | 131k | 76/76 |
| 66.166.0.0/15 | 131k | 76/76 |
| 72.244.0.0/15 | 131k | 76/76 |
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
- Valid48.3%965
- Invalid6.8%136
- No ROA44.8%895
Propagation
- Globally propagated90% of full-feed peers or more89.8%1,792
- Partially propagated40% to 90%0.7%13
- Seen by few peersUnder 40%9.6%191
Prefix sizes
IPv4 — 1,911 prefixes
- /14262k addresses0.2%4
- /15131k addresses0.6%11
- /1665.5k addresses2.1%41
- /1732.8k addresses2.3%43
- /1816.4k addresses2.7%51
- /198.2k addresses5.3%101
- /204.1k addresses4.1%79
- /212k addresses5.4%103
- /221k addresses10.6%202
- /23512 addresses10.5%201
- /24256 addresses55.7%1,065
- /25128 addresses<0.1%1
- /2664 addresses<0.1%1
- /2816 addresses0.2%3
- /298 addresses0.3%5
IPv6 — 85 prefixes
- /2934.4B × /649.4%8
- /3017.2B × /642.4%2
- /324.3B × /6437.6%32
- /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 longerAggregated17.6%15
Recent changes
Announcements that started or stopped since 11th Oct 2026.
- Announced189.13.179.0/2410th Nov 2026
- Announced189.13.180.0/2410th Nov 2026
- Withdrawn194.77.43.0/249th Nov 2026
- Announced131.125.20.0/225th Nov 2026
- Announced167.246.57.0/245th Nov 2026
- Withdrawn194.122.120.0/215th Nov 2026
- Withdrawn194.45.4.0/235th Nov 2026
- Withdrawn194.45.98.0/235th Nov 2026
- Withdrawn2001:668:1f:ff80::/645th Nov 2026
- Withdrawn62.132.42.0/235th Nov 2026
- Withdrawn131.125.20.0/224th Nov 2026
- Withdrawn167.246.57.0/244th Nov 2026
68 announced and 24 withdrawn in all; the most recent are shown.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.