Is Level3 / Lumen Secure?

Independent privacy and security audit of Level3 / Lumen DNS servers, with live monitoring data.

Last updated June 25, 2026

Fails Security Audit

Level3 / Lumen fails multiple security checks. We recommend considering a provider with better privacy and security features.

Security Audit Results

Check	Result	Details
DNSSEC Validation	No	Does not validate DNSSEC. Vulnerable to DNS cache poisoning attacks.
NXDOMAIN Hijacking	No	Returns proper NXDOMAIN responses for non-existent domains.
DNS-over-TLS (DoT)	Not supported	DNS queries are sent in plain text over this protocol.
DNS-over-HTTPS (DoH)	Not supported	No DoH endpoint available.
Logging Policy	Unknown retention policy
Reliability	81%	Based on continuous monitoring from our probe network.

Level3 / Lumen DNS Addresses

Type	IP Address
Primary	`4.2.2.1`
Secondary	`4.2.2.2`

Test Level3 / Lumen Yourself

Run a live privacy and security check on 4.2.2.1 from your location. Get DNSSEC, NXDOMAIN, encryption, and latency results in seconds.

Run Privacy Check on 4.2.2.1

How Level3 / Lumen Compares

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Frequently Asked Questions

Is Level3 / Lumen safe to use?

Level3 / Lumen fails several key security checks. Consider switching to a provider that supports DNSSEC, encrypted DNS, and does not hijack NXDOMAIN responses.

Does Level3 / Lumen log DNS queries?

Level3 / Lumen logging policy: Unknown retention policy. Always review the provider's current privacy policy for the latest details.

Does Level3 / Lumen support encrypted DNS?

Level3 / Lumen does not support encrypted DNS (neither DoT nor DoH). Your DNS queries travel in plain text and can be monitored by your ISP.

How reliable is Level3 / Lumen?

Level3 / Lumen (4.2.2.1) has a reliability score of 81% based on our continuous monitoring. This is acceptable uptime.

What are the DNS addresses for Level3 / Lumen?

Primary: 4.2.2.1, Secondary: 4.2.2.2. Configure both for redundancy.