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

AS4637 · ASN-TELSTRA-GLOBAL

Telstra International Limited

AS4637 is run by 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. The bulk of its IP address space is in the United Kingdom, with additional presence in the United States and Japan, and smaller footprints in 26 additional countries.

  • 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
April 18, 2026 (active)

Prefix Summary

IPv4 Prefixes (raw / aggregated)
646 / 272
IPv6 Prefixes (raw / aggregated)
13 / 4
IPv4 Addresses
1 146 880
Largest IPv4 Prefix
/15 (131 072 addresses)
Largest IPv6 Prefix
/31
Geolocated Countries
🇬🇧 United Kingdom (586 576 IPs), 🇺🇸 United States (523 312 IPs), 🇯🇵 Japan (356 880 IPs) and 26 more
Prefix Changed
April 10, 2026

Reputation

Reputation
Pristine — 0 flagged IPs

Connectivity Summary

Upstream Providers
5 upstreams providing transit
Peers
282 networks exchanging traffic without transit
Downstream Customers
387 downstreams buying transit
Unclassified
7 unclassified BGP neighbors
Degree
681 unique BGP neighbors
Reach
49 560 networks in customer cone

Upstream Providers (5)

  • AS3356 — LEVEL3 (Tier-1 transit)
  • AS6461 — ZAYO-6461 (Tier-1 transit)
  • AS1299 — TWELVE99 (Tier-1 transit)
  • AS2914 — NTT-DATA-2914 (Tier-1 transit)
  • AS701 — UUNET (Tier-1 transit)

Prefix Lists

IPv4 Prefixes (646 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))
  • 42.99.128.0/17 (32 768 addresses (/17 prefix))
  • 74.3.0.0/17 (32 768 addresses (/17 prefix))
  • 64.145.128.0/17 (32 768 addresses (/17 prefix))
  • 61.87.128.0/18 (16 384 addresses (/18 prefix))
  • 202.64.128.0/18 (16 384 addresses (/18 prefix))
  • 122.152.128.0/18 (16 384 addresses (/18 prefix))
  • 125.252.64.0/18 (16 384 addresses (/18 prefix))
  • 208.9.128.0/18 (16 384 addresses (/18 prefix))
  • 61.14.128.0/18 (16 384 addresses (/18 prefix))
  • 120.138.192.0/18 (16 384 addresses (/18 prefix))
  • 202.227.128.0/18 (16 384 addresses (/18 prefix))
  • 202.147.0.0/18 (16 384 addresses (/18 prefix))
  • 207.15.64.0/18 (16 384 addresses (/18 prefix))
  • 202.126.128.0/18 (16 384 addresses (/18 prefix))
  • 203.123.128.0/18 (16 384 addresses (/18 prefix))
  • 203.192.128.0/18 (16 384 addresses (/18 prefix))
  • 199.0.0.0/18 (16 384 addresses (/18 prefix))
  • 65.167.0.0/19 (8 192 addresses (/19 prefix))
  • 198.68.128.0/19 (8 192 addresses (/19 prefix))
  • 63.175.32.0/19 (8 192 addresses (/19 prefix))
  • 63.164.160.0/19 (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))
  • 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))
  • 63.160.224.0/19 (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))
  • 198.69.64.0/19 (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))
  • 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))
  • 193.82.96.0/19 (8 192 addresses (/19 prefix))
  • 208.29.96.0/19 (8 192 addresses (/19 prefix))
  • 154.8.0.0/19 (8 192 addresses (/19 prefix))
  • 208.30.128.0/19 (8 192 addresses (/19 prefix))
  • and 222 more

IPv6 Prefixes (13 total)

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