Autonomous System
AS3300 · British Telecommunications Limited
Overview
AS3300 is announced on the Internet: RIPE RIS route collectors currently see 123 IPv4 prefixes and 29 IPv6 prefixes originated by this network. Together, its IPv4 prefixes cover 513,280 addresses, with overlapping prefixes counted once. In the paths the collectors record, it has 32 upstream neighbours (transit providers or peers) and 20 downstream neighbours (customers or networks it carries). Its most visible upstreams are Arelion Sweden AB (AS1299), Telstra Global (AS4637), and NTT America, Inc. (AS2914). AS3300 was assigned by RIPE NCC, and its registration country is United Kingdom.
Source: RIPEstat (RIPE NCC), RIS route collectors. Read on October 16, 2026 at 8:58 PM UTC. This page is refreshed at most every 12 hours.
Go further
The trace goes to 205.248.0.1, the first address of 205.248.0.0/16. An address picked inside a prefix may not answer (nothing listens there, or the network filters probes): the trace then shows the path up to the last network that replies.
Announced prefixes
IPv4 prefixes (123 prefixes)
| Prefix | Addresses |
|---|---|
| 61.14.0.0/18 | 16,384 |
| 61.14.1.0/24 | 256 |
| 61.14.2.0/23 | 512 |
| 61.14.4.0/22 | 1,024 |
| 61.14.7.0/24 | 256 |
| 61.14.8.0/22 | 1,024 |
| 61.14.11.0/24 | 256 |
| 61.14.12.0/22 | 1,024 |
| 61.14.15.0/24 | 256 |
| 61.14.20.0/22 | 1,024 |
| 61.14.24.0/22 | 1,024 |
| 61.14.28.0/22 | 1,024 |
| 61.14.31.0/24 | 256 |
| 61.14.32.0/22 | 1,024 |
| 61.14.34.0/24 | 256 |
| 61.14.36.0/22 | 1,024 |
| 61.14.36.0/24 | 256 |
| 61.14.39.0/24 | 256 |
| 61.14.40.0/22 | 1,024 |
| 61.14.44.0/22 | 1,024 |
| 61.14.48.0/22 | 1,024 |
| 61.14.52.0/24 | 256 |
| 63.250.128.0/18 | 16,384 |
| 63.250.128.0/22 | 1,024 |
| 63.250.131.0/24 | 256 |
| 63.250.132.0/22 | 1,024 |
| 63.250.132.0/24 | 256 |
| 63.250.135.0/24 | 256 |
| 63.250.136.0/23 | 512 |
| 63.250.138.0/24 | 256 |
| 63.250.139.0/24 | 256 |
| 63.250.140.0/22 | 1,024 |
| 63.250.144.0/22 | 1,024 |
| 63.250.144.0/24 | 256 |
| 63.250.147.0/24 | 256 |
| 63.250.148.0/22 | 1,024 |
| 63.250.151.0/24 | 256 |
| 63.250.152.0/22 | 1,024 |
| 63.250.155.0/24 | 256 |
| 63.250.156.0/22 | 1,024 |
| 63.250.159.0/24 | 256 |
| 63.250.160.0/22 | 1,024 |
| 63.250.163.0/24 | 256 |
| 63.250.164.0/24 | 256 |
| 63.250.165.0/24 | 256 |
| 63.250.168.0/22 | 1,024 |
| 63.250.171.0/24 | 256 |
| 63.250.172.0/24 | 256 |
| 63.250.173.0/24 | 256 |
| 63.250.174.0/24 | 256 |
| 63.250.176.0/22 | 1,024 |
| 63.250.180.0/22 | 1,024 |
| 63.250.184.0/22 | 1,024 |
| 63.250.187.0/24 | 256 |
| 63.250.189.0/24 | 256 |
| 63.250.191.0/24 | 256 |
| 72.29.128.0/20 | 4,096 |
| 72.29.132.0/22 | 1,024 |
| 136.238.168.0/24 | 256 |
| 136.238.185.0/24 | 256 |
| 136.238.187.0/24 | 256 |
| 136.238.229.0/24 | 256 |
| 136.238.232.0/24 | 256 |
| 136.238.238.0/24 | 256 |
| 136.238.239.0/24 | 256 |
| 136.238.240.0/24 | 256 |
| 136.238.241.0/24 | 256 |
| 136.238.243.0/24 | 256 |
| 185.249.5.0/24 | 256 |
| 185.249.6.0/24 | 256 |
| 192.92.18.0/24 | 256 |
| 192.92.19.0/24 | 256 |
| 192.92.20.0/22 | 1,024 |
| 192.92.24.0/21 | 2,048 |
| 192.92.32.0/19 | 8,192 |
| 192.92.80.0/23 | 512 |
| 192.92.82.0/24 | 256 |
| 192.157.130.0/23 | 512 |
| 192.157.132.0/22 | 1,024 |
| 192.157.136.0/21 | 2,048 |
| 192.157.144.0/20 | 4,096 |
| 192.157.160.0/23 | 512 |
| 192.237.64.0/18 | 16,384 |
| 194.33.52.0/24 | 256 |
| 195.206.69.0/24 | 256 |
| 195.206.70.0/24 | 256 |
| 198.137.75.0/24 | 256 |
| 198.178.237.0/24 | 256 |
| 198.178.239.0/24 | 256 |
| 198.207.64.0/18 | 16,384 |
| 198.207.64.0/22 | 1,024 |
| 198.207.67.0/24 | 256 |
| 198.207.68.0/22 | 1,024 |
| 198.207.72.0/22 | 1,024 |
| 198.207.74.0/24 | 256 |
| 198.207.75.0/24 | 256 |
| 198.207.76.0/22 | 1,024 |
| 198.207.78.0/24 | 256 |
| 198.207.79.0/24 | 256 |
| 198.207.80.0/22 | 1,024 |
Showing the first 100 of 123, in address order. Complete list on RIPEstat
IPv6 prefixes (29 prefixes)
| Prefix |
|---|
| 2402:fb00::/32 |
| 2402:fb00::/36 |
| 2402:fb00:f00::/40 |
| 2402:fb00:1000::/36 |
| 2402:fb00:1f00::/40 |
| 2402:fb00:2000::/36 |
| 2402:fb00:2f00::/40 |
| 2402:fb00:3000::/36 |
| 2402:fb00:3f00::/40 |
| 2606:f100::/32 |
| 2606:f100::/36 |
| 2606:f100:f00::/40 |
| 2606:f100:1000::/36 |
| 2606:f100:1f00::/40 |
| 2606:f100:2000::/36 |
| 2606:f100:2f00::/40 |
| 2606:f100:3000::/36 |
| 2606:f100:3f00::/40 |
| 2606:f100:4000::/36 |
| 2606:f100:4f00::/40 |
| 2606:f100:5000::/36 |
| 2606:f100:5f00::/40 |
| 2606:f100:6000::/36 |
| 2606:f100:7000::/36 |
| 2606:f100:7f00::/40 |
| 2606:f100:8000::/36 |
| 2606:f100:8f00::/40 |
| 2606:f100:9000::/36 |
| 2606:f100:c000::/36 |
Neighbours
Upstreams (transit or peers) (32)
| AS | Network | Visibility |
|---|---|---|
| AS1299 | Arelion Sweden AB | 2,038 |
| AS4637 | Telstra Global | 1,424 |
| AS2914 | NTT America, Inc. | 1,324 |
| AS4657 | StarHub Ltd | 1,042 |
| AS3491 | PCCW Global (HK) Ltd. | 743 |
| AS6939 | Hurricane Electric LLC | 634 |
| AS9002 | RETN Limited | 280 |
| AS30844 | Liquid Telecommunications Ltd | 224 |
| AS6762 | TELECOM ITALIA SPARKLE S.p.A. | 202 |
| AS3303 | Swisscom (Schweiz) AG | 122 |
| AS6461 | Zayo Bandwidth | 119 |
| AS33891 | Core-Backbone GmbH | 70 |
| AS2497 | Internet Initiative Japan Inc. | 47 |
| AS8220 | COLT Technology Services Group Limited | 45 |
| AS37468 | Angola Cables | 42 |
| AS14840 | BR.Digital Telecom | 30 |
| AS4230 | CLARO S.A. | 28 |
| AS52320 | GlobeNet Cabos Submarinos Colombia, S.A.S. | 25 |
| AS9304 | HGC Global Communications Limited | 14 |
| AS2518 | BIGLOBE Inc. | 10 |
| AS31713 | - | 5 |
| AS4635 | Hong Kong Internet Exchange--Route Server 1 | 4 |
| AS7713 | PT Telekomunikasi Indonesia | 4 |
| AS20473 | The Constant Company, LLC | 4 |
| AS6057 | Administracion Nacional de Telecomunicaciones | 3 |
| AS6830 | LibertyGlobal Liberty Global Europe Holding B.V. | 2 |
| AS8359 | MTS PJSC | 2 |
| AS3741 | Dimension Data | 1 |
| AS5400 | British Telecommunications Limited | 1 |
| AS23764 | CTGNet | 1 |
The 30 most visible of 32.
Downstreams (customers) (20)
| AS | Network | Visibility |
|---|---|---|
| AS7246 | Bristol-Myers Squibb Company | 973 |
| AS22683 | Koninklijke Philips N.V. | 755 |
| AS136767 | BMW AG (Bayerische Motoren Werke Aktiengesellschaft) | 708 |
| AS40659 | BMW of North America, LLC (Group Data Centers America) | 545 |
| AS212565 | Specsavers Optical Group Limited | 502 |
| AS18872 | Veritas Technologies LLC | 353 |
| AS45187 | Rackspace IT Hosting AS IT Hosting Provider Hong Kong | 343 |
| AS399449 | Kyndryl | 277 |
| AS133782 | Elsevier Ltd | 263 |
| AS78 | BT Americas, Inc | 260 |
| AS72 | - | 258 |
| AS141399 | - | 258 |
| AS393493 | - | 252 |
| AS26478 | - | 251 |
| AS27000 | - | 251 |
| AS55290 | - | 135 |
| AS6220 | - | 134 |
| AS40126 | - | 47 |
| AS12200 | - | 39 |
| AS26380 | - | 18 |
31 more neighbours appear on both sides of this network depending on the path, so they are counted in neither list.
Visibility is RIPEstat's count of how often the route collectors observed the link. It compares neighbours with each other; it is not a traffic volume.
How to read this page
An Autonomous System (AS) is a network run under one routing policy: an internet provider, a cloud, a content network, a university. Each one has a number, its ASN, assigned by a regional registry (ARIN, RIPE NCC, APNIC, LACNIC, AFRINIC), and uses BGP, the protocol networks use to tell each other where addresses are, to announce the blocks of addresses it delivers to.
A prefix such as 203.0.113.0/24 is a block of addresses: the number after the slash says how many bits are fixed, so a /24 holds 256 IPv4 addresses and a /16 holds 65,536. Networks often announce a large block and smaller pieces of it at the same time, which is why the address total counts each address once.
Neighbours come from the paths themselves. A network that appears just before this one in a path, on the collector's side, is an upstream: a transit provider or a peer. One that appears just after it is a downstream, usually a customer. Peering at an internet exchange also shows up as an upstream, so the upstream list is not a list of paid transit.
The data comes from RIPEstat, run by the RIPE NCC, which gathers the routing tables of hundreds of networks through its RIS route collectors. This page reads it when it is visited and keeps it for 12 hours at most; the BGP viewer reads it live.