Home Prefix Lookup240c:c000::/21

240c:c000::/21 - China Education And Research Network Center (AS4538)

IPv6APNICannouncedAS4538ERX-CERNET-BKB - China Education and Research Network CenterNo ROA

CIDR

240c:c000::/21

IP Version

IPv6

Addresses

162259276.8Y

Mask

/21

Country

🇨🇳 China

City

Haidian (Haidian Qu)

RIR

APNIC

Status

announced

Allocated

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

Swipe sideways to see all columns →

Prefix	Origin AS	RPKI	IRR	Last Seen
240c:c000::/21	AS4538 ERX-CERNET-BKB - China Education and Research Network Center	No ROA	-	2026-10-26

Related Announcements

1 less-specific, 74 more-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
240c:c000::/20	AS23910 CNGI-CERNET2-AS-AP - China Next Generation Internet CERNET2	No ROA	-	2026-10-26
240c:c001::/32	AS24349 CNGI-BJ-IX3-AS-AP - CERNET2 IX at Peking University	Valid	-	2026-10-26
240c:c017::/32	AS24349 CNGI-BJ-IX3-AS-AP - CERNET2 IX at Peking University	Valid	-	2026-10-26
240c:c018::/32	AS24350 CNGI-BJ-IX4-AS-AP - CERNET2 IX at Beijing University of Posts and Telecommunications	Valid	-	2026-10-26
240c:c019::/32	AS24349 CNGI-BJ-IX3-AS-AP - CERNET2 IX at Peking University	Valid	-	2026-10-26
240c:c02f::/32	AS24349 CNGI-BJ-IX3-AS-AP - CERNET2 IX at Peking University	Valid	-	2026-10-26
240c:c035::/32	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a0::/32	AS23910 CNGI-CERNET2-AS-AP - China Next Generation Internet CERNET2	Invalid	-	2026-10-26
240c:c0a1::/32	AS4538 ERX-CERNET-BKB - China Education and Research Network Center	Valid	-	2026-10-26
240c:c0a1::/32	AS131490 CERT-Cor - CERNET Corporation	Valid	-	2026-10-26
240c:c0a2:200::/48	AS45576 CERNET2-TSINGHUA6-AS-AP - Tsinghua University	No ROA	-	2026-10-26
240c:c0a3:200::/48	AS45576 CERNET2-TSINGHUA6-AS-AP - Tsinghua University	No ROA	-	2026-10-26
240c:c0a4::/32	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	-	2026-10-26
240c:c0a6::/48	AS4538 ERX-CERNET-BKB - China Education and Research Network Center	No ROA	-	2026-10-26
240c:c0a8::/33	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a8::/34	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a8:3c82::/48	AS138370 CNGI-NCH-IX-AS-AP - CERNET2 regional IX at Nanchang University	Valid	-	2026-10-26
240c:c0a8:4000::/34	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a8:5c26::/48	AS24365 CNGI-SH-IX2-AS-AP - CERNET2 IX at Fudan University	Invalid	-	2026-10-26
240c:c0a8:5c49::/48	AS24366 CNGI-SH-IX3-AS-AP - CERNET2 IX at Tongji University	Valid	-	2026-10-26
240c:c0a8:8000::/33	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a8:8000::/34	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a8:9c01::/48	AS138440 CNGI-HAK-IX-AS-AP - CERNET2 regional IX at Hainan Normal University	Valid	-	2026-10-26
240c:c0a8:c000::/34	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	Valid	-	2026-10-26
240c:c0a9:1000::/40	AS4538 ERX-CERNET-BKB - China Education and Research Network Center	Valid	-	2026-10-26
240c:c0a9:1000::/40	AS23910 CNGI-CERNET2-AS-AP - China Next Generation Internet CERNET2	Valid	-	2026-10-26
240c:c0a9:1000::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	Invalid	-	2026-10-26
240c:c0a9:1100::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1200::/40	AS133512 CERNEWTECH-ZHENGZHOU - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1300::/40	AS133513 CERNEWTECH-CHENGDU - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1400::/40	AS38587 CERNET-IDC-AP - CERNET Internet Data Center	No ROA	-	2026-10-26
240c:c0a9:1401::/48	AS38587 CERNET-IDC-AP - CERNET Internet Data Center	No ROA	-	2026-10-26
240c:c0a9:1600::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1700::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1800::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1900::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1a00::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1b00::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1c00::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0a9:1d00::/40	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0aa:1::/48	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0aa:2::/48	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0aa:101::/48	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0aa:102::/48	AS133111 CNT-northChina - CERNET New Technology Co., Ltd	No ROA	-	2026-10-26
240c:c0ad:66::/48	AS23910 CNGI-CERNET2-AS-AP - China Next Generation Internet CERNET2	No ROA	-	2026-10-26
240c:c0ad:464::/48	AS23910 CNGI-CERNET2-AS-AP - China Next Generation Internet CERNET2	No ROA	-	2026-10-26
240c:c118::/32	AS24348 CNGI-BJ-IX2-AS-AP - CERNET2 IX at Tsinghua University	No ROA	-	2026-10-26
240c:c220::/32	AS24352 CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	Valid	-	2026-10-26
240c:c221::/32	AS24352 CNGI-TJN-IX-AS-AP - CERNET2 IX at Tianjin University	Valid	-	2026-10-26
240c:c246::/32	AS138375 CNGI-HHT-IX-AS-AP - CERNET2 regional IX at Inner Mongolia University	Valid	-	2026-10-26
240c:c283::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong University	Valid	-	2026-10-26
240c:c286::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong University	Valid	-	2026-10-26
240c:c288::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong University	Valid	-	2026-10-26
240c:c28f::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong University	Valid	-	2026-10-26
240c:c295::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong University	Valid	-	2026-10-26
240c:c29f::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong University	Valid	-	2026-10-26
240c:c341::/32	AS138441 CNGI-WLQ-IX-AS-AP - CERNET2 regional IX at Xinjiang University	Valid	-	2026-10-26
240c:c381::/32	AS138377 CNGI-XNN-IX-AS-AP - CERNET2 regional IX at Qinghai Normal University	Valid	-	2026-10-26
240c:c406::/32	AS24369 CNGI-SY-IX-AS-AP - CERNET2 IX at Northeast University	Valid	-	2026-10-26
240c:c410::/32	AS24369 CNGI-SY-IX-AS-AP - CERNET2 IX at Northeast University	Valid	-	2026-10-26
240c:c586::/32	AS24372 CNGI-HRB-IX-AS-AP - CERNET2 IX at Harbin Institute of Technology	Valid	-	2026-10-26
240c:c602::/32	AS24361 CNGI-NJ-IX-AS-AP - CERNET2 IX at Southeast University	Valid	-	2026-10-26
240c:c603::/32	AS24361 CNGI-NJ-IX-AS-AP - CERNET2 IX at Southeast University	Valid	-	2026-10-26
240c:c604::/32	AS24361 CNGI-NJ-IX-AS-AP - CERNET2 IX at Southeast University	Valid	-	2026-10-26
240c:c608::/32	AS24361 CNGI-NJ-IX-AS-AP - CERNET2 IX at Southeast University	Valid	-	2026-10-26
240c:c64c::/32	AS24361 CNGI-NJ-IX-AS-AP - CERNET2 IX at Southeast University	Valid	-	2026-10-26
240c:c651::/32	AS24361 CNGI-NJ-IX-AS-AP - CERNET2 IX at Southeast University	No ROA	-	2026-10-26
240c:c701::/32	AS24365 CNGI-SH-IX2-AS-AP - CERNET2 IX at Fudan University	Valid	-	2026-10-26
240c:c702::/32	AS24366 CNGI-SH-IX3-AS-AP - CERNET2 IX at Tongji University	Valid	-	2026-10-26
240c:c715::/32	AS24364 CNGI-SH-IX-AS-AP - CERNET2 IX at Shanghai Jiaotong University	Valid	-	2026-10-26
240c:c726::/32	AS24364 CNGI-SH-IX-AS-AP - CERNET2 IX at Shanghai Jiaotong University	Valid	-	2026-10-26
240c:c781::/32	AS24367 CNGI-HZH-IX-AS-AP - CERNET2 IX at Zhejiang University	Valid	-	2026-10-26
240c:c783::/32	AS24367 CNGI-HZH-IX-AS-AP - CERNET2 IX at Zhejiang University	Valid	-	2026-10-26
240c:c795::/32	AS24367 CNGI-HZH-IX-AS-AP - CERNET2 IX at Zhejiang University	Valid	-	2026-10-26
240c:c7b9::/32	AS24367 CNGI-HZH-IX-AS-AP - CERNET2 IX at Zhejiang University	Valid	-	2026-10-26

Origin ASN

AS4538

ERX-CERNET-BKB - China Education and Research Network Center

Related Prefixes

Covering prefix

240c:c000::/20AS23910

More prefixes of AS4538

All prefixes of AS4538 →

Geolocation

Country🇨🇳ChinaCN

RegionBeijing

CityHaidian (Haidian Qu)

Coordinates39.9997, 116.3260 ↗

Learn more

RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
RPKI validatorCheck ROA coverage for any prefix or ASN
What is BGP?How prefixes are announced and routed
More-specific prefixesGlossary: covering and more-specific routes
IPv4 transfers in the APNIC regionWho bought and sold address space recently

API

Open

GEThttps://api.ipctl.io/v1/prefix/240c:c000::/21

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

curl -s "https://api.ipctl.io/v1/prefix/240c:c000::/21" | jq

External Links

RIPEstat