Autonomous system
AS18413 GBTC-TW Great Taipei Broadband Company Ltd.
Unclassified APNIC
Summary
Great Taipei Broadband Company
residential isp taiwan broadband
GBTC-TW is operated by Great Taipei Broadband Company Ltd.
What it's used for
- The address space carries residential broadband traffic, evidenced by reverse DNS entries such as
h254.c203.GTBC.com.twandh61-67-2-254.GTBC.com.tw, which follow a host-based naming convention typical of consumer access networks. - The AS announces 8192 IPv4 addresses across 8 prefixes with only 3 observed neighbours, a ratio that indicates an access or eyeball network rather than a transit provider.
Notable
- Registrants for the majority of prefixes are listed as
IRT-GTBC-TWwith the netnameGTBC-NET, which aligns directly with the AS holder name. - The address inventory consists of a single /20 block and several smaller /22, /23, and /24 blocks within the 61.65.0.0/16 and 61.67.0.0/16 ranges, all located in Taiwan.
- No IPv6 prefixes are currently announced in the inventory.
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 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 8 prefixes · 8.19K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| TW | Taiwan, Province of China | 8 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS18413- Registry name
- GBTC-TW
- Abuse contact
- leoxue@gtbc.com.tw
- Registered
- 2008-09-04
- Last changed
- 2025-11-06
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 100% valid · 8 valid, 0 with no ROA
- ROAs
- 2 authorising AS18413
- ASPA
- no ASPA record
- IRR
- 100% registered · 8 of 8 announcements
- Route objects
- 326 naming AS18413
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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