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What is 1.0.0.1?

1.0.0.1 is Cloudflare DNS's secondary (backup) DNS address, the fallback for the primary 1.1.1.1, run by Cloudflare. Here's what it does and how it relates to the primary.

Updated 4 min read

What is 1.0.0.1?

1.0.0.1 is the secondary DNS resolver address for Cloudflare DNS, operated by Cloudflare — the backup your device falls back to when the primary (1.1.1.1) isn't answering. It resolves the same names, from the same service, as the primary. The fastest major resolver on most connections, with a strong no-logging privacy stance and no default filtering.

Operator
Cloudflare
This address
1.0.0.1 (secondary)
Paired address
1.1.1.1
Encrypted hostname (DoH/DoT)
1dot1dot1dot1.cloudflare-dns.com
  • No-log : yes
  • DNSSEC : yes
  • Malware blocking : no
  • Ad blocking : no
  • Family filter : no

How 1.0.0.1 works as a secondary address

1.0.0.1 is a backup resolver. Your operating system sends each DNS query to your primary DNS server first — for Cloudflare DNS that's 1.1.1.1 and only turns to 1.0.0.1 if the primary doesn't answer in time. It isn't queried in parallel, and it isn't "faster" or "slower" than the primary — it points to the same Cloudflare DNS service. The reason to set it is resilience: if the primary has a brief hiccup, your device keeps resolving names instead of failing.

Set 1.1.1.1 as your primary DNS and 1.0.0.1 as the secondary to get Cloudflare DNS either way.

Time 1.0.0.1 from your connection

This runs a live timing check against Cloudflare DNS's encrypted DoH endpoint — a browser can't query the raw IP 1.0.0.1 directly, so this is the closest honest measurement of that resolver from your network. Nothing is fabricated: if the endpoint can't be reached or read, the tool says so instead of guessing a number.

Runs in your browser against the resolver's DoH endpoint; nothing is stored. For a full multi-resolver comparison on your connection, use the DNS speed test.

Should you use it?

The fastest major resolver on most connections, with a strong no-logging privacy stance and no default filtering.

Best for: Raw speed, Privacy, Gaming.

Like any public resolver, Cloudflare DNS adds a small round trip compared with your ISP's default DNS, and it can't optimize CDN routing as tightly as a resolver peered locally with your network in every case. Use the live timing check above, or the full DNS speed test, to see whether it's actually faster than what you have now.

To use Cloudflare DNS, set 1.1.1.1 as your primary DNS and 1.0.0.1 as the secondary — see the device and router setup guides or read the Cloudflare DNS full review .

1.0.0.1 — frequently asked questions

Is 1.0.0.1 safe to use?

Yes. 1.0.0.1 is a legitimate public DNS address operated by Cloudflare (Cloudflare DNS). No query logging to disk and no client IP retained; anonymized data is purged within 24 hours. Independently audited.

Is 1.0.0.1 free?

Yes — Cloudflare DNS is a free public resolver. Point your device or router's DNS at 1.1.1.1 (primary) and 1.0.0.1 (secondary).

Does 1.0.0.1 log my activity?

No query logging to disk and no client IP retained; anonymized data is purged within 24 hours. Independently audited.

Is 1.0.0.1 faster than my ISP's DNS?

Often, but it depends on your location and network. Use the timing button above to measure it from your own connection, or run the full DNS speed test.

What's the difference between 1.0.0.1 and 1.1.1.1?

1.1.1.1 is Cloudflare DNS's primary DNS address and 1.0.0.1 is the secondary. Your device queries the primary first and only falls back to 1.0.0.1 if the primary stops answering. Both point to the same Cloudflare DNS service with the same features, so the secondary is there for redundancy, not extra speed — set 1.1.1.1 as your first DNS entry and 1.0.0.1 as the second.