Home Prefix Lookup203.173.81.0/24

203.173.81.0/24 - BGP Prefix

IPv4APNICassigned RPKI Valid

CIDR

203.173.81.0/24

IP Version

IPv4

Addresses

256

Mask

/24 (255.255.255.0)

Country

🇯🇵 Japan

City

Ōtsu

RIR

APNIC

Status

assigned

Allocated

Announced BGP Routes

0 of 0 routes

RPKI:

IRR:

Swipe sideways to see all columns →

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

Covering Prefix

1 less-specific announcement

Prefix	Origin AS	RPKI	IRR	Last Seen
203.173.80.0/22	AS56309 SIAMDATA-TH - Siamdata Communication Co.,Ltd.	Valid	-	2026-10-12

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
203.173.80.0/21	AS56309	/24	apnic

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS56309	APNIC	MAINT-READYIDC-TH	2026-10-02

Transfer History

Registry transfers of 203.173.81.0/24, blocks inside it, or blocks containing it.

203.173.80.0/21Transfer · 2026-09-18
Foresightwave INC.
🇯🇵 JP APNIC
→
READYIDC CO., LTD.
🇹🇭 TH APNIC
203.173.80.0/21Transfer · 2012-02-09
Sanmedia Corporation
🇯🇵 JP APNIC
→
Foresightwave INC.
🇯🇵 JP APNIC

Date	Resource	From	To	Type
2026-09-18	203.173.80.0/21	Foresightwave INC. 🇯🇵 JP APNIC	READYIDC CO., LTD. 🇹🇭 TH APNIC	Transfer
2012-02-09	203.173.80.0/21	Sanmedia Corporation 🇯🇵 JP APNIC	Foresightwave INC. 🇯🇵 JP APNIC	Transfer

Related Prefixes

Covering prefix

203.173.80.0/22AS56309

Geolocation

Country🇯🇵JapanJP

RegionShiga

CityŌtsu

Coordinates34.9857, 135.9250 ↗

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/203.173.81.0/24

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

curl -s "https://api.ipctl.io/v1/prefix/203.173.81.0/24" | jq

External Links

RIPEstat