asn.dev

Autonomous system

AS23881 UDOMAIN-AS-AP UDomain Web Hosting Company Ltd

Hosting ARIN

IPv4 addresses 18.18K 30 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly HK
Exchanges 0 recorded by PCH
Upstreams 5 0 downstream
Flagged prefixes 0 none

Summary

UDomain Web Hosting Company Limited

Hong Kong · AI-generated

hosting business hk

UDOMAIN-AS-AP is operated by UDomain Web Hosting Company Limited.

What it's used for

  • The address space carries hosting infrastructure, evidenced by netnames such as WEBHOST, UDOMAIN-HK, and NEWSKY, and registrants including Web Host Ltd and New Sky Internet Limited.
  • The AS announces 17920 IPv4 addresses across 30 prefixes and 1 IPv6 prefix, with only 5 observed neighbours, indicating a hosting or business network rather than a transit provider.

Notable

  • Registrants include UDomain Web Hosting Company Limited, Web Host Ltd, and New Sky Internet Limited, suggesting a consolidated operation or shared infrastructure among related entities.
  • The inventory consists of a mix of /20, /22, /23, and /24 blocks, with the largest being 203.135.128.0/20.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

5 upstream, 0 downstream and 6 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS140570Hong Kong Beecloud System Technology Services Limited2,124
AS9304HGC Global Communications Limited2,073
AS60068Datacamp Limited60
AS4515PCCW IMS Ltd (PCCW Business Internet Access)59
AS10098Towngas Telecommunications Fixed Network Ltd1

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-19, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 30 prefixes · 18.18K addresses IPv6 1 prefixes

CountryNamePrefixes
HKHong Kong31

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS23881
Registry name
UDOMAIN-AS-AP
Registrant
UDomain Web Hosting Company Limited
Abuse contact
report_abuse@udomain.hk
Registered
2008-09-04
Last changed
2020-06-15
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
97% valid · 71 valid, 2 with no ROA
ROAs
87 authorising AS23881
ASPA
no ASPA record
IRR
100% registered · 73 of 73 announcements
Route objects
358 naming AS23881

Reputation

Classification and threat

Hosting Datacenter or cloud provider. Addresses are servers, not people.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,783 prefixes, as published 2026-10-20. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check