Network · AS21378

AS21378 PJSC Rostelecom

AS21378 (PJSC Rostelecom) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS21378

  • OwnerPJSC Rostelecom
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses13,312
  • IPv4 ranges20
  • IPv6 ranges1
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 84.42.16.0/20
  • 84.42.0.0/21
  • 80.246.64.0/22
  • 84.42.14.0/23
  • 84.42.10.0/23
  • 80.246.94.0/23
  • 80.246.88.0/23
  • 80.246.82.0/23
  • 80.246.76.0/23
  • 80.246.68.0/23
  • 84.42.9.0/24
  • 84.42.12.0/24

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

Check an IP address →

Detect it in code

Spot AS21378 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 AS21378

Is AS21378 a datacenter or VPN network?

AS21378 (PJSC Rostelecom) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS21378?

AS21378 is registered to PJSC Rostelecom. It announces about 13,312 IPv4 addresses.

How do I detect traffic from AS21378?

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.