Home Prefix Lookup211.81.0.0/16

211.81.0.0/16

🇨🇳

IPv4APNICallocatedNo ROA

CIDR

211.81.0.0/16

IP Version

IPv4

Addresses

65.5K

Mask

/16 (255.255.0.0)

Country

🇨🇳 China

City

Haidian (Haidian Qu)

RIR

APNIC

Status

allocated

Allocated

2/14/2001

Announced BGP Routes

0 of 0 routes

RPKI:

IRR:

Prefix	Origin AS	RPKI	IRR	Last Seen
This prefix is not currently announced in BGP. See covering prefix below.

Covering Prefix

73 less-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
211.80.0.0/13	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.0.0/17	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.128.0/17	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.0.0/17	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.128.0/17	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.80.0/20	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.224.0/20	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.240.0/20	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.128.0/20	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.160.0/20	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.48.0/20	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.80.0/20	AS24348CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	—	5/31/2026
211.81.240.0/20	AS24348CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	—	5/31/2026
211.81.48.0/20	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.224.0/20	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.160.0/20	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.128.0/20	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.200.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.64.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.24.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.216.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.72.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.96.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.192.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.152.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.144.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.120.0/21	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.144.0/21	AS24348CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	—	5/31/2026
211.81.24.0/21	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.192.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.64.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.72.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.96.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.120.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.152.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.200.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.216.0/21	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.32.0/22	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.40.0/22	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.176.0/22	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.20.0/22	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.64.0/22	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.212.0/22	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.64.0/22	AS24348CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	—	5/31/2026
211.81.32.0/22	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.40.0/22	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.212.0/22	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.176.0/22	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.96.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.44.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.128.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.40.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.145.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.24.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.20.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.200.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.208.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.212.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.22.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.224.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.120.0/24	AS4538ERX-CERNET-BKB - China Education and Research Network Center	No ROA	—	5/31/2026
211.81.145.0/24	AS24348CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	—	5/31/2026
211.81.40.0/24	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.22.0/24	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.24.0/24	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.20.0/24	AS24352CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	No ROA	—	5/31/2026
211.81.208.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.96.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.128.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.120.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.200.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.212.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026
211.81.224.0/24	AS138182CNGI-SJZ-IX-AS-AP - CERNET2 regional IX at Hebei Normal University	No ROA	—	5/31/2026

Geolocation

Country🇨🇳ChinaCN

RegionBeijing

CityHaidian (Haidian Qu)

Coordinates39.9997, 116.3260 ↗

API

Open

GEThttps://api.ipctl.io/v1/prefix/211.81.0.0/16

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/211.81.0.0/16" | jq

External Links

RIPEstat Hurricane Electric BGP