Autonomous system
AS18180 TWNIC-AS Taiwan Network Information Center
Unclassified DROP-listed space APNIC
Summary
TWNIC
registry infrastructure government
TWNIC-AS is the autonomous system for Taiwan Network Information Center.
What it's used for
- The address space carries infrastructure for the national registry, with reverse DNS entries pointing to
unknown.itsidc.comand netnames set toCYNET. - The AS announces 4608 IPv4 addresses across 9 prefixes and maintains 4 observed neighbours, a ratio consistent with a specialized infrastructure or registry network rather than a large access provider.
Notable
- All registrants for the announced prefixes are listed as
IRT-CNNIC-CN, which differs from the TWNIC announcer, suggesting the space may be leased or managed under a different registry authority. - The inventory consists of a single contiguous block within the 221.128.0.0/16 range, subdivided into nine smaller prefixes.
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
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-14, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 5.89K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| TW | Taiwan, Province of China | 4 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS18180- Registry name
- TWNIC-AS
- Abuse contact
- hostmaster@twnic.tw
- Registered
- 2020-08-05
- Last changed
- 2021-11-04
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 15 with no ROA
- ROAs
- 0 authorising AS18180
- ASPA
- no ASPA record
- IRR
- 100% registered · 15 of 15 announcements
- Route objects
- 5 naming AS18180
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
4 DROP matches Announced space overlapping the DROP prefix list.
| Announced | DROP entry | Record |
|---|---|---|
| 221.128.128.0/22 | 221.128.128.0/17 | SBL677746 |
| 221.128.195.0/24 | 221.128.128.0/17 | SBL677746 |
| 221.128.236.0/23 | 221.128.128.0/17 | SBL677746 |
| 221.128.240.0/20 | 221.128.128.0/17 | SBL677746 |
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,773 prefixes, as published 2026-10-13. 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