asn.dev

Autonomous system

AS17623 CNCGROUP-SZ China Unicom Shenzen network

Unclassified APNIC

IPv4 addresses 456K 372 prefixes
IPv6 prefixes 355 counted as prefixes, not addresses
Countries 1 mostly CN
Exchanges 0 recorded by PCH
Upstreams 2 4 downstream
Flagged prefixes 0 none

Summary

China Unicom Shenzhen

China · AI-generated

telecom residential mobile china

CNCGROUP-SZ is the AS handle for China Unicom Shenzhen, a regional division of the Chinese state-owned telecommunications provider China Unicom.

What it's used for

  • The address space carries residential and mobile traffic, evidenced by netnames such as UNICOM-GD and UNICOM-GDSZ associated with the Guangdong region.
  • The AS announces 455,424 IPv4 addresses across 369 prefixes and 337 IPv6 prefixes, while maintaining only 5 observed neighbours, a ratio indicative of a large access or eyeball network rather than a transit provider.

Notable

  • Registrants for the majority of prefixes are IRT-CU-CN and CNCGROUP GD, which align with the China Unicom identity, though one prefix (202.170.128.0/19) is registered to NovaNetwork.
  • The inventory is heavily subdivided into /19 and /20 blocks, reflecting a granular allocation strategy typical of large-scale consumer ISP deployments.

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, 4 downstream and 8 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS4837CHINA UNICOM China169 Backbone60,735
AS9929CHINA UNICOM Industrial Internet Backbone385

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 372 prefixes · 456K addresses IPv6 355 prefixes

CountryNamePrefixes
CNChina727

Registry

Allocation record

APNIC · via Atlas (registry + RDAP)
Registry
APNIC
Handle
AS17623
Registry name
CNCGROUP-SZ
Abuse contact
hqs-ipabuse@chinaunicom.cn
Registered
2008-09-04
Last changed
2023-10-21
Allocation
allocated

Routing security

RPKI and IRR

Full detail
RPKI
99.4% valid · 1,265 valid, 4 with no ROA 3 RPKI-invalid
ROAs
1,270 authorising AS17623
ASPA
no ASPA record
IRR
82% registered · 1,047 of 1,272 announcements 19 other origin
Route objects
2,380 naming AS17623

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 1,772 prefixes, as published 2026-10-15. 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