Network · AS19977

AS19977 Mayer Brown LLP

AS19977 (Mayer Brown LLP) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS19977

OwnerMayer Brown LLP
KindInternet service provider
Servers, not peopleno
IPv4 addresses2,048
IPv4 ranges1
IPv6 ranges0

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

143.58.0.0/21

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

Check an IP address →

Detect it in code

Spot AS19977 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 AS19977

Is AS19977 a datacenter or VPN network?

AS19977 (Mayer Brown LLP) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS19977?

AS19977 is registered to Mayer Brown LLP. It announces about 2,048 IPv4 addresses.

How do I detect traffic from AS19977?

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.