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Anycast Detected

How does bgp.tools detect anycast prefixes?

When bgp.tools scanned this prefix, we found that 203.99.24.1 was anycasted.

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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description
	AS174	Cogent Communications, LLC

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Peers

	ASN	Description
	AS1239	Sprint Wireline (Cogent)
	AS174	Cogent Communications, LLC

inetnum:        203.99.20.0 - 203.99.31.255
netname:        ZDNS
descr:          Internet Domain Name System Beijing Engineering Resrarch Center Ltd.
descr:          4,South 4th street, Zhongguancun,Haidian District,Beijing
country:        CN
admin-c:        XZ4638-AP
tech-c:         XZ4638-AP
abuse-c:        AC1601-AP
status:         ALLOCATED PORTABLE
mnt-by:         MAINT-CNNIC-AP
mnt-routes:     MAINT-CNNIC-AP
mnt-irt:        IRT-CNNIC-CN
last-modified:  2021-06-16T01:32:29Z
source:         APNIC

Last Update: 2026-06-03T03:23:03Z UTC

IRR Databases

IRR	Expected ASN
apnic	AS38345	Show Raw route: 203.99.24.0/24 descr: Internet Domain Name System Beijing Engineering Resrarch Center Ltd. country: CN origin: AS38345 mnt-by: MAINT-CNNIC-AP last-modified: 2019-10-14T02:25:50Z source: APNIC

RPKI Chain (Current origin: Valid)