Network · AS17977

AS17977 Singapore Telecom Japan Ltd

AS17977 (Singapore Telecom Japan Ltd) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS17977

OwnerSingapore Telecom Japan Ltd
KindInternet service provider
Servers, not peopleno
IPv4 addresses7,680
IPv4 ranges4
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

203.173.64.0/20
120.72.72.0/21
120.72.68.0/22
120.72.66.0/23

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-22.

Check an IP address →

Detect it in code

Spot AS17977 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 AS17977

Is AS17977 a datacenter or VPN network?

AS17977 (Singapore Telecom Japan Ltd) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS17977?

AS17977 is registered to Singapore Telecom Japan Ltd. It announces about 7,680 IPv4 addresses.

How do I detect traffic from AS17977?

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.