Network · AS55900

AS55900 GLBB Japan KK

AS55900 (GLBB Japan KK) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS55900

OwnerGLBB Japan KK
KindInternet service provider
Servers, not peopleno
IPv4 addresses52,992
IPv4 ranges22
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

180.131.224.0/19
27.0.16.0/20
198.144.128.0/20
180.131.208.0/20
172.97.80.0/20
137.220.16.0/20
109.236.0.0/20
104.222.192.0/20
218.223.128.0/21
202.171.224.0/21
104.222.208.0/21
43.248.160.0/22

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-21.

Check an IP address →

Detect it in code

Spot AS55900 traffic at signup.

Send the visitor's IP. The response includes the ASN, the owner and flags.hosting.

curl https://veqen-app.com/v1/ip/check \
  -H "Authorization: Bearer $VEQEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"ip": "203.0.113.7"}'

import os, requests

r = requests.post(
    "https://veqen-app.com/v1/ip/check",
    headers={"Authorization": f"Bearer {os.environ['VEQEN_API_KEY']}"},
    json={"ip": "203.0.113.7"},
    timeout=10,
)
result = r.json()
print(result["risk"]["verdict"], result["risk"]["reasons"])

const res = await fetch("https://veqen-app.com/v1/ip/check", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.VEQEN_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"ip": "203.0.113.7"}),
});
const result = await res.json();
console.log(result.risk.verdict, result.risk.reasons);

Questions

About AS55900

Is AS55900 a datacenter or VPN network?

AS55900 (GLBB Japan KK) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS55900?

AS55900 is registered to GLBB Japan KK. It announces about 52,992 IPv4 addresses.

How do I detect traffic from AS55900?

Call the Veqen IP check with the visitor's address. The response includes the ASN, the owner and whether the network is a datacenter, VPN network, relay or ISP.