Network · AS15258

AS15258 Gilbane Building Company

AS15258 (Gilbane Building Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS15258

OwnerGilbane Building Company
KindInternet service provider
Servers, not peopleno
IPv4 addresses768
IPv4 ranges2
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

204.90.12.0/23
204.90.14.0/24

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

Check an IP address →

Detect it in code

Spot AS15258 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 AS15258

Is AS15258 a datacenter or VPN network?

AS15258 (Gilbane Building Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS15258?

AS15258 is registered to Gilbane Building Company. It announces about 768 IPv4 addresses.

How do I detect traffic from AS15258?

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.