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Data as of Nov 15, 2026

210.51.20.0/22

No anonymizer space · no proxy exits in 30 days

China Unicom · space held by China Unicom IP network

Announcement
this exact prefix
RPKI valid
Announced by
AS138421
Type
Hosting
50% of it

Announcements

Less specific

Covering announcements

PrefixOriginTypeProxy exitsHolderRPKI
210.51.0.0/16
since May 2005
AS9929Internet provider61
3 always on
China Unicom IP network
More specific

Announcements inside

PrefixOriginTypeHolderRPKI
210.51.21.0/24
since Sep 2006
AS9929Internet providerChina Unicom IP network
via Shanghai Caohejing IDC of China Netcom
210.51.22.0/24
since Sep 2006
AS9929Internet providerChina Unicom IP network
via Shanghai Caohejing IDC of China Netcom

Registrations in this block

The registry's network records over the announcement: those covering it, widest first, then every record inside it, under its parent.

RangeAddressesNetnameHolderTypeCreatedAbuse contact
210.51.0.0/1665,536UNICOM-CNChina Unicom IP networkALLOCATED PORTABLE—hqs-ipabuse@chinaunicom.cn
└ 210.51.20.0 - 210.51.63.25511,264CNC-SH-IDCShanghai Caohejing IDC of China NetcomALLOCATED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via UNICOM-CN
└ 210.51.20.0/2732jinzhenghuang-technological-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.32/2732caishengcai-food-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.64/2732zhunzuobiao-stock-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.96/2732zhijiashuangxing-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.128/2732jingshi-software-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.160/2732taihai-technological-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.192/2732zhongai-advertisement-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.20.224/2732guorenju-communication-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.0/2816huaxinfei-business-consultative-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.16/2816hetengxun-software-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.32/2732lujietong-transport-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.64/2732sijie-advertisement-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.96/2732shenzhoudake-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.128/2732yingbaohuan-trade-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.160/2732nahande-electron-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.192/2732xingdejin-trade-corpshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC
└ 210.51.22.224/2732longbo-food-Ltdshanghai cityASSIGNED NON-PORTABLE—hqs-ipabuse@chinaunicom.cn
via CNC-SH-IDC

A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.

Composition

The types across the prefix's announced space, by addresses.

Announced space

Address share

Announced space

Types across the prefix

1,024 addresses
TypeAddressesShareRanges
Hosting51250%2
Business25625%9
Internet provider25625%1

Network & registry

AnnouncementRouting historyRPKI & IRRWhois & abuse
Routing timeline

Covering aggregate above, the prefix's own history below

Summary

Routing history

Pattern
Stable
First seen
May 2005
Current origin since
Aug 2021 · 5.2 yr
Origin networks
4
Last change of origin
Aug 2021
Recorded history

History

Handoffs
3