asn.dev

Autonomous system

AS18185 NTCU-AS-TW 4F, No.114, Sec.1, Chung-Shiao W. Road

Unclassified APNIC

IPv4 addresses 4.10K 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly TW
Exchanges 0 recorded by PCH
Upstreams 1 2 downstream
Flagged prefixes 0 none

Summary

National Taiwan Chung Hwa University

Taiwan, Province of China · AI-generated

education university taiwan

The AS handle NTCU-AS-TW is held by National Taiwan Chung Hwa University.

What it's used for

  • The address space carries the university's network, identified by the netname TWNCTU-NET and registrant IRT-TWNCTU-TW.
  • The AS announces 4096 IPv4 addresses across 1 prefix (211.76.240.0/20) with 3 observed neighbours, a ratio consistent with an institutional access network rather than a transit provider.

Notable

  • The registrant TWNCTU-NET aligns with the announcer NTCU-AS-TW, confirming the space belongs to the university.
  • The inventory consists of a single contiguous /20 block, typical for a campus network estate.

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

1 upstream, 2 downstream and 5 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS4780Digital United Inc.59

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

Shape and geography

IPv4 1 prefixes · 4.10K addresses IPv6 0 prefixes

CountryNamePrefixes
TWTaiwan, Province of China1

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS18185
Registry name
NTCU-AS-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 AS18185
ASPA
no ASPA record
IRR
100% registered · 1 of 1 announcements
Route objects
32 naming AS18185

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: 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

Cross-check