Network · AS17661

AS17661 NHN JAPAN Corp.

AS17661 (NHN JAPAN Corp.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS17661

OwnerNHN JAPAN Corp.
KindInternet service provider
Servers, not peopleno
IPv4 addresses11,520
IPv4 ranges16
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

27.147.96.0/20
183.90.200.0/21
119.235.228.0/22
183.90.196.0/23
183.90.192.0/23
119.235.238.0/23
119.235.226.0/23
203.104.159.0/24
183.90.222.0/24
183.90.221.0/24
183.90.199.0/24
183.90.195.0/24

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

Check an IP address →

Detect it in code

Spot AS17661 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 AS17661

Is AS17661 a datacenter or VPN network?

AS17661 (NHN JAPAN Corp.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS17661?

AS17661 is registered to NHN JAPAN Corp.. It announces about 11,520 IPv4 addresses.

How do I detect traffic from AS17661?

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.