221.214.0.0/15

Currently announced by AS4837 China Unicom, in the routed prefix 221.214.0.0/15.

Current ASN: AS4837; China Unicom
Routed prefix: 221.214.0.0/15; Most specific route covering this prefix
ASNs over time: 1; 1 announcement record
RIR allocation: APNIC; China · 221.214.0.0/15

Routing data · Nov 10, 2026, 12:46 UTC

ASN historyEvery routed prefix covering 221.214.0.0/15

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
221.214.0.0/15	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing

More specific routes18 total

Prefix	ASN	Name	Registered country	First seen (UTC)	Last seen (UTC)	Status
221.214.0.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.7.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.18.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.19.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.86.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.105.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.140.0/24	AS4837	China Unicom	China	2026-11-09 10:21	2026-11-10 12:46	Announcing
221.214.176.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.177.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.178.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.214.214.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.25.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.97.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.108.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.113.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.155.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.177.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing
221.215.219.0/24	AS4837	China Unicom	China	Before monitoring	2026-11-10 12:46	Announcing

Change logAll changes

The routes covering this address have had no origin changes since ASNBase started monitoring.

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RIR allocation record

Registry: APNIC
Allocated block: 221.214.0.0/15
Country: China
Allocation date: 2003-12-11
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.