Network · AS21730

AS21730 Halstad Telephone Company

AS21730 (Halstad Telephone Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS21730

OwnerHalstad Telephone Company
KindInternet service provider
Servers, not peopleno
IPv4 addresses12,288
IPv4 ranges3
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

65.61.64.0/19
204.73.192.0/21
199.199.224.0/21

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

Check an IP address →

Detect it in code

Spot AS21730 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 AS21730

Is AS21730 a datacenter or VPN network?

AS21730 (Halstad Telephone Company) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS21730?

AS21730 is registered to Halstad Telephone Company. It announces about 12,288 IPv4 addresses.

How do I detect traffic from AS21730?

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.