Network · AS25511

AS25511 JSC "RCS"

AS25511 (JSC "RCS") looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS25511

OwnerJSC "RCS"
KindInternet service provider
Servers, not peopleno
IPv4 addresses6,144
IPv4 ranges3
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

217.12.240.0/20
91.103.196.0/22
185.108.0.0/22

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

Check an IP address →

Detect it in code

Spot AS25511 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 AS25511

Is AS25511 a datacenter or VPN network?

AS25511 (JSC "RCS") looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS25511?

AS25511 is registered to JSC "RCS". It announces about 6,144 IPv4 addresses.

How do I detect traffic from AS25511?

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.