139.159.166.0/23

Currently announced jointly by AS4808 China Unicom Beijing Province Network, AS23724 IDC, China Telecommunications Corporation, AS63727 Huawei CBG, in the routed prefix 139.159.166.0/23.

Current ASN: AS4808 AS23724 AS63727; China Unicom Beijing Province Network
Routed prefix: 139.159.166.0/23; Most specific route covering this prefix
ASNs over time: 3; 3 announcement records
RIR allocation: APNIC; China · 139.159.0.0/16

Routing data · Nov 8, 2026, 10:26 UTC

ASN historyEvery routed prefix covering 139.159.166.0/23

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
139.159.166.0/23	AS4808	China Unicom Beijing Province Network	China	Before monitoring	2026-11-08 10:26	Announcing
139.159.166.0/23	AS23724	IDC, China Telecommunications Corporation	China	Before monitoring	2026-11-08 10:26	Announcing
139.159.166.0/23	AS63727	Huawei CBG	China	2026-11-03 22:22	2026-11-08 10:26	Announcing

More specific routes0 total

No more specific routes inside this prefix.

Change logAll changes

Detected (UTC)	Prefix	Change	ASN	Name	Previous ASN	Country
2026-11-03 22:22	139.159.166.0/23	Origin added	AS63727	Huawei CBG	AS4808 AS23724	China

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RIR allocation record

Registry: APNIC
Allocated block: 139.159.0.0/16
Country: China
Allocation date: 2011-03-09
Status: allocated

From the RIRs’ delegated statistics files. Shows where the addresses are registered, not where they are used.

How monitoring works

Every 2 hours ASNBase takes the bgp.tools global routing table (prefix → origin ASN) and compares it with the previous one. The detected time is the time of that comparison; the actual change can be up to about 2 hours earlier.
Only routes seen by more than 100 bgp.tools peers are listed as changes; routes with less visibility are only kept in the history.
A new announcement counts only if it is still in the next routing table, and a withdrawal only if the prefix is missing from two tables in a row, so short flaps are ignored.
ASNBase has been monitoring since 2026-10-19. “Before monitoring” under “First seen” means the route was already announced when monitoring started; the earlier date is unknown.
Prefixes first seen during the first day of monitoring do not count as new announcements: most of them were simply missing from the table at the moment monitoring started.
Countries and regions follow the ASN’s registration, not the actual location of the IP addresses.