Home Prefix Lookup172.121.39.0/24

172.121.39.0/24 - Internet Initiative Japan (AS2497)

IPv4ARINannouncedAS2497IIJ - Internet Initiative Japan Inc. RPKI Valid

CIDR

172.121.39.0/24

IP Version

IPv4

Addresses

256

Mask

/24 (255.255.255.0)

Country

🇯🇵 Japan

City

Chiyoda City

RIR

ARIN

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
172.121.39.0/24	AS2497 IIJ - Internet Initiative Japan Inc.	Valid	ARINOther IRR	2026-10-12

Covering Prefix

1 less-specific announcement

Prefix	Origin AS	RPKI	IRR	Last Seen
172.121.38.0/23	AS18779 EGIHOSTING - EGIHosting	No ROA	-	2026-10-12

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
172.121.39.0/24	AS2497	/24	arin

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS2497	ARIN	MNT-EGNL-1	2026-08-31
AS2497	Other IRR	MAINT-AS214937	2026-09-02

Origin ASN

AS2497

IIJ - Internet Initiative Japan Inc.

Related Prefixes

Covering prefix

172.121.38.0/23AS18779

More prefixes of AS2497

All prefixes of AS2497 →

Geolocation

Country🇯🇵JapanJP

RegionTokyo

CityChiyoda City

Coordinates35.6940, 139.7540 ↗

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 ARIN regionWho bought and sold address space recently

API

Open

GEThttps://api.ipctl.io/v1/prefix/172.121.39.0/24

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

curl -s "https://api.ipctl.io/v1/prefix/172.121.39.0/24" | jq

External Links

RIPEstat