asn.dev

Autonomous system

AS9924 TFN-TW Taiwan Fixed Network, Telco and Network Service Provider.

Residential APNIC NSP

IPv4 addresses 1.52M 462 prefixes
IPv6 prefixes 62 counted as prefixes, not addresses
Countries 1 mostly TW
Flagged prefixes 0 none

Summary

Taiwan Fixed Network (TFN)

Taiwan · AI-generated

isp residential transit legacy

AS9924 (TFN-TW) is held by Taiwan Fixed Network Co., Ltd., the largest privately owned fixed-line telecom operator in Taiwan and a member of the Taiwan Mobile group. TFN was established in 2000 when Taiwan opened its fixed-network market to competitors of the incumbent, and it now sells access, enterprise ICT and wholesale connectivity. This ASN is its main production network.

What it's used for

Both eyeballs and transit, which is unusual and is visible directly in the numbers. RIS sees 625 IPv4 prefixes carrying about 1.9 million addresses, 10 IPv6 prefixes including a 2001:4540::/27, and 102 observed BGP neighbours. The address count alone says access network; a hundred-plus neighbours says the network also sells and exchanges transit rather than merely buying it. TFN is genuinely both: a national alternative carrier with its own subscriber base and its own peering fabric.

The reverse DNS confirms the eyeball half. Sampled addresses across 124.8, 175.96, 175.98, 219.80 and 219.86 all resolve under tfn.net.tw, split cleanly into two templates: 175-96-0-5.dynamic.tfn.net.tw for dynamic access lines and 175-98-0-5.static.tfn.net.tw for statically assigned customers. Sitting among them is 5.tfn.ip4.au.edu.tw — a university's own naming inside TFN space, which is the signature of a downstream institutional customer using addresses assigned by its provider.

Notable

  • The v4 footprint is anchored on several /14s and /15s and then reannounced as component /16s, a large-carrier traffic-engineering pattern.
  • IPv6 is properly deployed here, including legacy 2001:454x blocks alongside the newer 2403:82c0::/32.

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

Address space

Summary

Full explorer
CountryNamePrefixes
TWTaiwan, Province of China524

Registry

Allocation record

via APNIC RDAP
Registry
APNIC
Handle
AS9924
Registry name
TFN-TW
Abuse contact
nickchang@taiwanmobile.com
Registered
2008-09-04
Last changed
2025-11-06
Status
active

Declared

PeeringDB profile

self-reported
Name
Taiwan Fixed Network
Also known as
TFN
Network type
NSP
Scope
Asia Pacific
Traffic ratio
Mostly Inbound
Peering policy
Open
IRR as-set
AS-TFN-TRANSIT1
Present at
10 exchanges
Facilities
5 facilities
Website
http://www.taiwanmobile.com

PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.

Reputation

Classification and threat

Residential Fixed-line consumer ISP. Addresses here are homes.

No IC3 indicators Nothing from the FBI IC3 feed.

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

Elsewhere

Cross-check