$ query “AS4637” --type=asn → 1 result(s)

AS4637 · ASN-TELSTRA-GLOBAL

Telstra International Limited

AS4637 belongs to Telstra International Limited and is a major transit provider, based in Hong Kong SAR China. The system announces an impressive 1.1 million IPv4 addresses, including a /15, and supports IPv6. Most of its address space is geolocated to the United Kingdom, with additional presence in the United States and Japan, and smaller footprints in 25 additional countries. This AS has recently updated its prefix announcements.

  • Top 5% — Top 5% of all autonomous systems by reach and degree
  • #18 by Reach — Top 100 by customer cone size
  • #2 in Hong Kong SAR China — Top 10 by reach within country

Basic Information

Country
🇭🇰 Hong Kong SAR China
Category
Internet Service Provider
Network Role
Major Transit
Data Origin
Authoritative — Metadata from authoritative RIR registry (ARIN, RIPE, APNIC, etc.)
Last Changed
March 04, 2026
Last Seen
June 22, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
642 / 272
IPv6 Prefixes (raw / aggregated)
13 / 4
IPv4 Addresses
1 145 600
Largest IPv4 Prefix
/15 (131 072 addresses)
Largest IPv6 Prefix
/31
Geolocated Countries
🇬🇧 United Kingdom (586 832 IPs), 🇺🇸 United States (522 800 IPs), 🇯🇵 Japan (356 864 IPs) and 25 more
Prefix Changed
June 20, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
5 upstreams providing transit
Peers
280 networks exchanging traffic without transit
Downstream Customers
378 downstreams buying transit
Unclassified
16 unclassified BGP neighbors
Degree
679 unique BGP neighbors
Reach
52 047 networks in customer cone

Upstream Providers (5)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS6461 — MFNX (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS701 — UUNET (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (642 total)

  • 195.152.0.0/15 (131 072 addresses (/15 prefix))
  • 134.159.0.0/16 (65 536 addresses (/16 prefix))
  • 146.101.0.0/16 (65 536 addresses (/16 prefix))
  • 154.32.0.0/16 (65 536 addresses (/16 prefix))
  • 202.84.128.0/17 (32 768 addresses (/17 prefix))
  • 74.3.0.0/17 (32 768 addresses (/17 prefix))
  • 42.99.128.0/17 (32 768 addresses (/17 prefix))
  • 64.145.128.0/17 (32 768 addresses (/17 prefix))
  • 203.123.128.0/18 (16 384 addresses (/18 prefix))
  • 202.227.128.0/18 (16 384 addresses (/18 prefix))
  • 202.64.128.0/18 (16 384 addresses (/18 prefix))
  • 199.0.0.0/18 (16 384 addresses (/18 prefix))
  • 202.147.0.0/18 (16 384 addresses (/18 prefix))
  • 61.14.128.0/18 (16 384 addresses (/18 prefix))
  • 61.87.128.0/18 (16 384 addresses (/18 prefix))
  • 202.126.128.0/18 (16 384 addresses (/18 prefix))
  • 203.192.128.0/18 (16 384 addresses (/18 prefix))
  • 207.15.64.0/18 (16 384 addresses (/18 prefix))
  • 125.252.64.0/18 (16 384 addresses (/18 prefix))
  • 122.152.128.0/18 (16 384 addresses (/18 prefix))
  • 120.138.192.0/18 (16 384 addresses (/18 prefix))
  • 208.9.128.0/18 (16 384 addresses (/18 prefix))
  • 208.29.96.0/19 (8 192 addresses (/19 prefix))
  • 63.160.224.0/19 (8 192 addresses (/19 prefix))
  • 63.175.32.0/19 (8 192 addresses (/19 prefix))
  • 63.172.128.0/19 (8 192 addresses (/19 prefix))
  • 202.128.128.0/19 (8 192 addresses (/19 prefix))
  • 63.164.160.0/19 (8 192 addresses (/19 prefix))
  • 65.160.160.0/19 (8 192 addresses (/19 prefix))
  • 65.161.96.0/19 (8 192 addresses (/19 prefix))
  • 65.163.96.0/19 (8 192 addresses (/19 prefix))
  • 65.166.32.0/19 (8 192 addresses (/19 prefix))
  • 65.166.192.0/19 (8 192 addresses (/19 prefix))
  • 65.167.0.0/19 (8 192 addresses (/19 prefix))
  • 65.167.160.0/19 (8 192 addresses (/19 prefix))
  • 65.170.224.0/19 (8 192 addresses (/19 prefix))
  • 65.171.32.0/19 (8 192 addresses (/19 prefix))
  • 65.171.192.0/19 (8 192 addresses (/19 prefix))
  • 65.173.160.0/19 (8 192 addresses (/19 prefix))
  • 65.174.32.0/19 (8 192 addresses (/19 prefix))
  • 203.101.128.0/19 (8 192 addresses (/19 prefix))
  • 203.112.224.0/19 (8 192 addresses (/19 prefix))
  • 63.161.224.0/19 (8 192 addresses (/19 prefix))
  • 203.190.64.0/19 (8 192 addresses (/19 prefix))
  • 208.30.128.0/19 (8 192 addresses (/19 prefix))
  • 198.69.64.0/19 (8 192 addresses (/19 prefix))
  • 198.68.128.0/19 (8 192 addresses (/19 prefix))
  • 61.8.32.0/19 (8 192 addresses (/19 prefix))
  • 193.82.192.0/19 (8 192 addresses (/19 prefix))
  • 193.82.128.0/19 (8 192 addresses (/19 prefix))

IPv6 Prefixes (13 total)

  • 2001:cc8::/31
  • 2001:cb0::/32
  • 2403:e800::/32
  • 2a02:1620::/32