Home Prefix Lookup240c:c800::/21

240c:c800::/21 - China Education And Research Network Center (AS4538)

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

CIDR

240c:c800::/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:c800::/21	AS4538 ERX-CERNET-BKB - China Education and Research Network Center	No ROA	-	2026-10-26

Related Announcements

1 less-specific, 62 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:c803::/32	AS24362 CNGI-HEF-IX-AS-AP - CERNET2 IX at University of Science and Technology of China	Valid	-	2026-10-26
240c:c901::/32	AS138370 CNGI-NCH-IX-AS-AP - CERNET2 regional IX at Nanchang University	Valid	-	2026-10-26
240c:c981::/32	AS24355 CNGI-CD-IX-AS-AP - CERNET2 IX at University of Electronic Science and Technology of China	Valid	-	2026-10-26
240c:c983::/32	AS24355 CNGI-CD-IX-AS-AP - CERNET2 IX at University of Electronic Science and Technology of China	Valid	-	2026-10-26
240c:c99d::/32	AS24355 CNGI-CD-IX-AS-AP - CERNET2 IX at University of Electronic Science and Technology of China	Valid	-	2026-10-26
240c:ca02::/32	AS138371 CNGI-QDA-IX-AS-AP - CERNET2 regional IX at Ocean University of China	Valid	-	2026-10-26
240c:ca03::/32	AS138371 CNGI-QDA-IX-AS-AP - CERNET2 regional IX at Ocean University of China	Valid	-	2026-10-26
240c:ca04::/32	AS4538 ERX-CERNET-BKB - China Education and Research Network Center	Valid	-	2026-10-26
240c:ca04::/32	AS132553 UPC-AS-CN - China University of Petroleum (East China)	Invalid	-	2026-10-26
240c:ca05::/32	AS138371 CNGI-QDA-IX-AS-AP - CERNET2 regional IX at Ocean University of China	Valid	-	2026-10-26
240c:ca07::/32	AS138371 CNGI-QDA-IX-AS-AP - CERNET2 regional IX at Ocean University of China	Valid	-	2026-10-26
240c:ca09::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca0b::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca0c::/32	AS138371 CNGI-QDA-IX-AS-AP - CERNET2 regional IX at Ocean University of China	Valid	-	2026-10-26
240c:ca0d::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca0e::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca0f::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca10::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca11::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca12::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca13::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca14::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca15::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca18::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca19::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca1b::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca1d::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca21::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca23::/32	AS138371 CNGI-QDA-IX-AS-AP - CERNET2 regional IX at Ocean University of China	Valid	-	2026-10-26
240c:ca28::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca29::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca30::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca38::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	No ROA	-	2026-10-26
240c:ca43::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca47::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca48::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca49::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:ca49:8000::/33	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:caa1::/32	AS24363 CNGI-JNN-IX-AS-AP - CERNET2 IX at Shandong University	Valid	-	2026-10-26
240c:cb02::/32	AS24360 CNGI-ZHZ-IX-AS-AP - CERNET2 IX at Zhengzhou University	Valid	-	2026-10-26
240c:cb06::/32	AS24360 CNGI-ZHZ-IX-AS-AP - CERNET2 IX at Zhengzhou University	Valid	-	2026-10-26
240c:cb21::/32	AS24360 CNGI-ZHZ-IX-AS-AP - CERNET2 IX at Zhengzhou University	Valid	-	2026-10-26
240c:cb3a::/32	AS24360 CNGI-ZHZ-IX-AS-AP - CERNET2 IX at Zhengzhou University	Valid	-	2026-10-26
240c:cc02::/32	AS24358 CNGI-WH-IX-AS-AP - CERNET2 IX at Huazhong University of Science and Technology	Valid	-	2026-10-26
240c:cd01:cd01::/48	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cd05:cd05::/48	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cd15:1000::/48	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cd22::/32	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cd22:cd22::/48	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cd44::/32	AS138369 CNGI-SZH-IX-AS-AP - CERNET2 regional IX at Shenzhen University	Valid	-	2026-10-26
240c:cd45::/32	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cda1::/32	AS24357 CNGI-GZ-IX-AS-AP - CERNET2 IX at South China University of Technology	Valid	-	2026-10-26
240c:cda3::/32	AS138369 CNGI-SZH-IX-AS-AP - CERNET2 regional IX at Shenzhen University	Valid	-	2026-10-26
240c:ce04::/32	AS24359 CNGI-CHS-IX-AS-AP - CERNET2 IX at Central South University	Valid	-	2026-10-26
240c:ce81::/32	AS138393 CNGI-NAN-IX-AS-AP - CERNET2 regional IX at Guangxi University	Valid	-	2026-10-26
240c:ce83::/32	AS138438 CNGI-GLN-IX-AS-AP - CERNET2 regional IX at Guangxi Normal University	Valid	-	2026-10-26
240c:ce84::/32	AS138438 CNGI-GLN-IX-AS-AP - CERNET2 regional IX at Guangxi Normal University	Valid	-	2026-10-26
240c:ce89::/32	AS138438 CNGI-GLN-IX-AS-AP - CERNET2 regional IX at Guangxi Normal University	Valid	-	2026-10-26
240c:ceaa::/32	AS138393 CNGI-NAN-IX-AS-AP - CERNET2 regional IX at Guangxi University	Valid	-	2026-10-26
240c:cec1::/32	AS138440 CNGI-HAK-IX-AS-AP - CERNET2 regional IX at Hainan Normal University	Valid	-	2026-10-26
240c:cf81::/32	AS138378 CNGI-KMN-IX-AS-AP - CERNET2 regional IX at Yunnan University	Valid	-	2026-10-26
240c:cfc3::/32	AS24353 CNGI-XA-IX-AS-AP - CERNET2 IX at Xi'an Jiaotong 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:c800::/21

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

curl -s "https://api.ipctl.io/v1/prefix/240c:c800::/21" | jq

External Links

RIPEstat