Home ASN LookupAS51044

AS51044 RHE Kazuki Yamaguchi

🇯🇵

Org handle: ORG-KY31-RIPE

RHE-NET

RIPE NCCallocated

Announced Prefixes (BGP)

21total

3 IPv418 IPv6

IPv4 Addresses

Allocated (RIR)1,536

Announced (BGP)1,536

IPv6 Addresses

Allocated (RIR)7.9×10²⁹

Announced (BGP)1.5×10²⁹

Prefix Limit (IPv4)

Prefix Limit (IPv6)

100

Country

🇯🇵 JP

RIR

RIPE NCC

Status

allocated

Allocated

2019-09-03

Routing hygiene

Score 3/100 · Low risk

RPKI ROA coverage

100%

no RPKI invalid prefixes

IRR route objects

100%

no origin mismatches

Hijack signals

0 announced against others' ROAs, 0 own announced by others

Upstreams

diversity 67/100

All announced prefixes have a valid ROA and a matching IRR route object

Based on 21 announced prefixes, updated daily (2026-10-23). How the score works · RPKI explained

Announced Prefixes

(BGP)21

Prefix	RPKI	IRR	Last Seen
45.148.172.0/22	Valid	Other IRRRIPE	-
45.148.172.0/24	Valid	RIPE	-
45.148.173.0/24	Valid	RIPE	-
2a0f:600::/48	Valid	RIPE	-
2a0f:600:604::/46	Valid	RIPE	-
2a0f:600:604::/47	Valid	RIPE	-
2a0f:600:604::/48	Valid	RIPE	-
2a0f:600:605::/48	Valid	RIPE	-
2a0f:600:606::/48	Valid	RIPE	-
2a0f:600:607::/48	Valid	RIPE	-

1-10 of 21

1 / 3

Allocated Prefixes

(RIR)7

Prefix	Country	RIR	Status
45.148.172.0/22	🇯🇵 JP	RIPENCC	allocated
45.148.172.0/24	🇯🇵 JP	RIPE	assigned
45.148.173.0/24	🇯🇵 JP	RIPE	assigned
2a0f:600::/29	🇯🇵 JP	RIPENCC	allocated
2a0f:600::/48	🇯🇵 JP	RIPE	assigned
2a0f:601::/32	🇯🇵 JP	RIPE	assigned
2a0f:602::/32	🇪🇺 EU	RIPE	assigned

All 21 announced prefixes of AS51044 →

BGP Neighbours

(seen in AS paths)

Upstreams (5)

Networks AS51044 hands its own prefixes to: transit providers, or peers at an exchange.

AS20473The Constant Company8
AS34549MEER Meerfarbig & . KG5
AS57578MISAKA CIS Misaka Network4
AS6939Hurricane Electric2
AS142616Misaka Network2

ASPA

No ASPA

Abuse Contact

External Links

RIPE Whois RIPEstat

Learn more

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS51044 should publish an ASPA object
IPv4 transfers in the RIPE NCC regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Open

GEThttps://api.ipctl.io/v1/asn/51044

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/51044" | jq