Network · AS104

AS104 University of Colorado at Boulder

AS104 (University of Colorado at Boulder) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS104

OwnerUniversity of Colorado at Boulder
KindInternet service provider
Servers, not peopleno
IPv4 addresses91,136
IPv4 ranges16
IPv6 ranges1

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

128.138.0.0/16
129.19.192.0/18
198.11.16.0/20
146.5.20.0/22
198.59.82.0/23
198.59.54.0/23
192.12.244.0/23
192.12.240.0/23
204.228.80.0/24
198.59.81.0/24
198.59.70.0/24
198.59.7.0/24

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

Check an IP address →

Detect it in code

Spot AS104 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 AS104

Is AS104 a datacenter or VPN network?

AS104 (University of Colorado at Boulder) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS104?

AS104 is registered to University of Colorado at Boulder. It announces about 91,136 IPv4 addresses.

How do I detect traffic from AS104?

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.