Network · AS15121

AS15121 Calaveras Internet Company

AS15121 (Calaveras Internet Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS15121

OwnerCalaveras Internet Company
KindInternet service provider
Servers, not peopleno
IPv4 addresses5,120
IPv4 ranges2
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

66.102.144.0/20
198.105.28.0/22

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

Check an IP address →

Detect it in code

Spot AS15121 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 AS15121

Is AS15121 a datacenter or VPN network?

AS15121 (Calaveras Internet Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS15121?

AS15121 is registered to Calaveras Internet Company. It announces about 5,120 IPv4 addresses.

How do I detect traffic from AS15121?

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.