Data as of Nov 14, 2026
210.51.8.0/21
No anonymizer space · no proxy exits in 30 daysChina Unicom Beijing Province Network · space held by China Unicom IP network
Announcements
Less specific
Covering announcements
| Prefix | Origin | Type | Proxy exits | Holder | RPKI |
|---|---|---|---|---|---|
| 210.51.0.0/16 since May 2005 | AS9929 | Internet provider | 61 3 always on | China Unicom IP network |
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.
| Range | Addresses | Netname | Holder | Type | Created | Abuse contact |
|---|---|---|---|---|---|---|
| 210.51.0.0/16 | 65,536 | UNICOM-CN | China Unicom IP network | ALLOCATED PORTABLE | — | hqs-ipabuse@ |
| └ 210. | 5,120 | CNC-BJ-IDC | Beijing Tongtai IDC of China Netcom | ALLOCATED NON-PORTABLE | — | hqs-ipabuse@ via UNICOM-CN |
| └ 210.51.8.0/27 | 32 | lantie-software-Ltd | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.32/27 | 32 | jieshitong-transport-Ltd | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.64/28 | 16 | xinmifeng-advertisement-corp | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.80/28 | 16 | xinlianhe-communication-Ltd | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.96/27 | 32 | taideyuan-realty-Ltd | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.128/27 | 32 | zhongguangzhisheng-network-corp | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.160/27 | 32 | yinhe-network-communication-corp | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.192/27 | 32 | taipingyangyixin-technological | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
| └ 210.51.8.224/27 | 32 | xingchao-network-communication | xicheng district,beijing china | ASSIGNED NON-PORTABLE | — | hqs-ipabuse@ via CNC-BJ-IDC |
A contact marked “via” is the registry's: the record names none of its own, so the registry hands down its parent's.
Network & registry
IPv4 market
Holder
- Organization
- China Unicom IP network
- Range
- 210.
51. 0. 0/ 16 - Registration type
- ALLOCATED PORTABLE
- Reallocated to
- Beijing Tongtai IDC of China Netcom
- Reallocated range
- 210.
51. 0. 0 - 210. 51. 19. 255 - Reallocation type
- ALLOCATED NON-PORTABLE
Origin network
AS4808
CN
- Name
- China Unicom Beijing Province Network
- Type
- Internet provider
- Registered
- Jan 9, 1996
- Domain
- chinaunicom.cn
- Industry
- Internet Service Provider (ISP)
- Spamhaus ASN-DROP
- not listed
Routing timeline
Covering aggregate above, the prefix's own history below
Summary
Routing history
- Pattern
- Stable
- First seen
- Mar 2006
- Current origin since
- Feb 2021 · 5.8 yr
- Origin networks
- 2
- Last change of origin
- Feb 2021
Recorded history
History
- Handoffs
- 1
RPKI
Route origin authorizations
| ROA prefix | ASN | Max len | Anchor | Verdict |
|---|---|---|---|---|
| 210.51.8.0/21 | AS4808 | /21 | APNIC | RPKI valid |
Whois
Registration for this announcement
- Range
- 210.
51. 0. 0 - 210. 51. 19. 255 - Netname
- CNC-BJ-IDC
- Registrant
- Beijing Tongtai IDC of China Netcom
- Registrant country
- CN
- Organization
- Beijing Tongtai IDC of China Netcom
- Org country
- CN
- Type
- ALLOCATED NON-PORTABLE
- Created
- Not stated by the registry
- Updated
- Sep 4, 2008
- Maintainer
- MAINT-CN-ZM28
- RIR
- APNIC
- Country
- CN
- Delegated
- Oct 11, 2000
- Status
- assigned
Report abuse
Abuse contact
- hqs-ipabuse@
chinaunicom. cn - Name
- ABUSE CUCN
- Handle
- AC1718-AP