Network · AS31400

AS31400 firstcolo GmbH

AS31400 (firstcolo GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS31400

  • Ownerfirstcolo GmbH
  • KindInternet service provider
  • Servers, not peopleno
  • IPv4 addresses10,752
  • IPv4 ranges14
  • IPv6 ranges2
Risk score0

Nothing suspicious found.

Largest IPv4 ranges

  • 77.37.16.0/20
  • 77.37.12.0/22
  • 77.37.116.0/22
  • 77.37.0.0/22
  • 77.37.6.0/23
  • 77.37.112.0/23
  • 77.37.104.0/23
  • 77.37.10.0/23
  • 77.37.9.0/24
  • 77.37.77.0/24
  • 77.37.75.0/24
  • 77.37.66.0/24

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

Check an IP address →

Detect it in code

Spot AS31400 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 AS31400

Is AS31400 a datacenter or VPN network?

AS31400 (firstcolo GmbH) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS31400?

AS31400 is registered to firstcolo GmbH. It announces about 10,752 IPv4 addresses.

How do I detect traffic from AS31400?

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.