AS17421 Data Communication Business Group,

AS17421Data Communication Business Group,ISP

WHOIS Topology

Taiwan · APNICcht.com.tw

Home broadband

IPv4 addresses

1.655.808

191 announced prefixes

IPv6 addresses

4.05 × 10³¹

34 announced prefixes

BGP neighbours

…

CAIDA rank

#12.930

Customer cone 1 ASNs

Estimated users

4,52 Tr

APNIC: 4,53 Tr

RPKI

100% valid

0 invalid · 0 not covered

Average purity

83 sampled IPs

IXPs / facilities

0 / 0

Operator self-reported

History

How prefixes were announced and changed hands, registration changes, and outage or hijack incidents.

Loading routing history…

IP ranges

Currently announced prefixes with their RIR registration and geolocation.

Prefix	RPKI	Registration	Geolocation	Addresses
42.74.0.0/16	Valid	EMOME-NETAPNIC	Kaohsiung	65.536
42.75.0.0/16	Valid	EMOME-NETAPNIC	Kaohsiung	65.536
111.80.0.0/16	Valid	EMOME-NETAPNIC	Xinyi	65.536
42.73.0.0/17	Valid	EMOME-NETAPNIC	Taoyuan	32.768
42.73.128.0/17	Valid	EMOME-NETAPNIC	Taoyuan	32.768
42.79.0.0/17	Valid	EMOME-NETAPNIC	Taoyuan	32.768
111.82.0.0/17	Valid	EMOME-NETAPNIC	Taichung	32.768
111.82.128.0/17	Valid	EMOME-NETAPNIC	Taichung	32.768
223.143.0.0/17	Valid	EMOME-NETAPNIC	Taipei	32.768
42.70.0.0/18	Valid	EMOME-NETAPNIC	New Taipei City	16.384
42.70.64.0/18	Valid	EMOME-NETAPNIC	New Taipei City	16.384
42.70.128.0/18	Valid	EMOME-NETAPNIC	New Taipei City	16.384
42.70.192.0/18	Valid	EMOME-NETAPNIC	New Taipei City	16.384
42.71.0.0/18	Valid	EMOME-NETAPNIC	Taichung	16.384
42.71.64.0/18	Valid	EMOME-NETAPNIC	Changhua	16.384
42.71.128.0/18	Valid	EMOME-NETAPNIC	Dacun	16.384
42.71.192.0/18	Valid	EMOME-NETAPNIC	Xiushui	16.384
42.72.0.0/18	Valid	EMOME-NETAPNIC	Hsinchu	16.384
42.72.64.0/18	Valid	EMOME-NETAPNIC	Hsinchu	16.384
42.72.128.0/18	Valid	EMOME-NETAPNIC	Taoyuan	16.384

/24 block profile

One square per /24: colour shows the risk type, shade how many addresses are flagged, stripes mark datacenter blocks. Click a square to see all 256 addresses.

/24s with data 118 / 6.468 （2%） · flagged 70

No risk flagsDatacenter (no flags)ProxyVPNAbuse / blocklistTorDarker = more flagged addresses; dashed = block screen only

111.70.0.0/1840/64 with data · 40 flagged

221.120.0.0/218/8 with data · 8 flagged

114.137.192.0/184/64 with data · 0 flagged

42.74.0.0/163/256 with data · 0 flagged

114.136.128.0/183/64 with data · 1 flagged

116.59.12.0/223/4 with data · 3 flagged

42.75.0.0/162/256 with data · 0 flagged

111.80.0.0/162/256 with data · 0 flagged

42.73.0.0/172/128 with data · 0 flagged

42.79.0.0/172/128 with data · 0 flagged

111.82.0.0/172/128 with data · 0 flagged

42.71.128.0/182/64 with data · 0 flagged

Hover a square for its numbers; click to see all 256 addresses.

Each prefix shows its 64 /24s with the most data. Built daily from lookups, neighbour sampling, public lists and block screening.

IP reputation

IPs from this network that CleanIP has analysed: purity, abuse reports and the riskiest /24 blocks.

Purity distribution

85–100 6870–84 750–69 80–49 0

0.05%

Share of IPv4 reported or blocklisted

799

Listed IPs

Analysed IPs

Flagged = VPN, proxy, Tor or purity below 50. Samples come from user lookups and neighbour sampling, not every address in this network.

Geography

Where this network’s IPv4 addresses are located.

Taiwan100.0%

Scope: Single country
In registered country: 100.0%

Estimated by sampling IPv4 ranges against a geolocation database.

Quan sát lưu lượng

AS17421 · 7 ngày qua

Di động so với Desktop

Desktop34.1%Di động65.9%

Bot so với Người thật

Người thật91.2%Bot8.8%

Mức áp dụng & sử dụng

Mức áp dụng và sử dụng các giao thức chính

Phiên bản HTTP

HTTP/1.x

8.9%HTTP/2

57.3%HTTP/3

33.8%

HTTP so với HTTPS

99.4% HTTPS (có mã hóa)

HTTP thuần 0.6%

Phiên bản TLS

TLS 1.0/1.1< 0.1%TLS 1.24.7%TLS 1.361.3%QUIC34.0%

Bảo mật & Tấn công

Thông tin chi tiết về lưu lượng tấn công tầng mạng và tầng ứng dụng

Tấn công Layer 7

GET

77.1%POST

15.3%HEAD

6.3%PUT

0.9%OPTIONS

0.3%Khác

0.1%

Quảng bá BGP

Số lần quảng bá tuyến BGP theo từng giờ trong 7 ngày qua

1.095.547

Tổng 7 ngày

66.161

Đỉnh theo giờ

Dữ liệu: Cloudflare Radar, theo giấy phép CC BY-NC 4.0

Đang tải…

Upstream và láng giềng BGP

AS17421Trang riêng

Đang tải upstream và láng giềng…

WHOIS record

The registry’s record for this AS number: holder, status, dates and contacts.

Sources

Where the information on this page comes from and when it was updated.

Information	Source	Updated
Registered country	RIR daily delegation statistics	2026-10-22
Registered address & allocation date	RIR registration data (RDAP)	2026-10-08
Organization & company country	AS-to-organization data	2026-10-21
Network type	CleanIP ASN canon	2026-10-22
Announced prefixes & BGP neighbours	Public BGP routing data	2026-10-22
IPv4 geography	Geolocation database	—
RPKI validation	RPKI ROA validation data	2026-10-22
Rank & customer cone	CAIDA AS Rank	2026-10-01
Estimated users (APNIC)	APNIC Labs user estimates	2026-10-20
Network tags	Public routing data community tags	2026-10-22
IP reputation	CleanIP lookups and neighbour sampling	—

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