asn.dev

Autonomous system

AS18420 NCU-TW National Central University

Unclassified APNIC

IPv4 addresses 65.54K 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly TW
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

National Central University

Taiwan, Province of China · AI-generated

education university taiwan

NCU-TW is the autonomous system for National Central University.

What it's used for

  • The space carries university infrastructure, indicated by the netname T-NCU.EDU.TW-NET and the registrant NCU-TW.
  • The AS announces 65536 IPv4 addresses within a single /16 prefix (140.115.0.0/16) and maintains 2 observed neighbours, a ratio consistent with an institutional access network rather than a transit provider.

Notable

  • The RDAP registrant is listed as unknown for the prefix, while the registry holder is explicitly NCU-TW - National Central University.
  • The address inventory consists of a single contiguous /16 block with no IPv6 prefixes announced.

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

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS181854F, No.114, Sec.1, Chung-Shiao W. Road56
AS7539National Center for High-performance Computing6

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, 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 1 prefixes · 65.54K addresses IPv6 0 prefixes

CountryNamePrefixes
TWTaiwan, Province of China1

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS18420
Registry name
NCU-TW
Abuse contact
noc@mail.moe.gov.tw
Registered
2008-09-04
Last changed
2025-11-06
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 1 valid, 0 with no ROA
ROAs
1 authorising AS18420
ASPA
no ASPA record
IRR
100% registered · 1 of 1 announcements
Route objects
2 naming AS18420

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.

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: 436 networks and 1,771 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

Cross-check