Network · AS51557

AS51557 Isimtescil Bilisim A.S.

AS51557 (Isimtescil Bilisim A.S.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS51557

OwnerIsimtescil Bilisim A.S.
KindInternet service provider
Servers, not peopleno
IPv4 addresses7,680
IPv4 ranges11
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

93.89.224.0/20
185.33.232.0/22
185.111.232.0/23
91.93.152.0/24
91.93.151.0/24
91.93.149.0/24
91.93.146.0/24
84.51.38.0/24
84.51.25.0/24
84.51.21.0/24
185.111.234.0/24

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

Check an IP address →

Detect it in code

Spot AS51557 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 AS51557

Is AS51557 a datacenter or VPN network?

AS51557 (Isimtescil Bilisim A.S.) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS51557?

AS51557 is registered to Isimtescil Bilisim A.S.. It announces about 7,680 IPv4 addresses.

How do I detect traffic from AS51557?

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.