All tools

Catalog

All tools

Fast, private network tools: IP geolocation, DNS checks, WHOIS, DNS propagation, traceroute, security analysis and more. No ads, no signup.

Network

Low-level network queries and diagnostics.

IP Lookup

Instant geolocation, ISP, ASN, abuse history and reputation for any IPv4 or IPv6 address.

WHOIS Lookup

Domain ownership, registrar, nameservers and key dates.

Updated

Speed Test

Latency and throughput test against a globally-distributed edge.

New

ASN Lookup

Holder, announced prefixes, upstreams and downstreams for any AS number, IP or name.

Telekom Peering

Live packet loss and connect times from a Deutsche Telekom line to each Cloudflare address range.

DNS & Mail

DNS records, mail server posture, deliverability.

DNS Lookup

Query A, AAAA, MX, TXT, NS, SOA, CNAME, CAA and SRV records from authoritative resolvers.

Mail Check

Domain mail posture: MX, SPF, DKIM selector probe, DMARC.

DKIM Check

Find a domain's DKIM selectors automatically, or check one you already know.

DNS Propagation

Query a record from probes in several countries at once and see whether they agree.

New

Email Header Analyzer

Paste raw headers: route with delays, SPF, DKIM, DMARC, likely origin and a plain verdict.

Security

Threat intel, vulnerabilities, reputation.

Updated

Subdomain Finder

Enumerate subdomains across 7 passive sources.

CVE Search

Search vulnerabilities by CVE ID, product, or keyword.

New

Blocklist Check

Check an IPv4 address against fifteen threat feeds, grouped by category.

New

Reverse IP Lookup

List all domains hosted on an IPv4 address from passive DNS, with links to DNS and WHOIS.

Utilities

Calculators, references, password tools.

Subnet Calculator

IPv4 + IPv6 CIDR math: range, mask, usable hosts, wildcard.

Password Strength

Password entropy, breach status, strength audit.

Ports Reference

Searchable reference of common TCP/UDP ports and services.

API Reference

REST API reference for every tool. Free for non-commercial use.

New

JWT Decoder

Decode header and payload, explain claims, check expiry and verify HMAC signatures in your browser.

New

Base64 & URL Encoder

Base64, URL, hex and HTML entity encoding with live two-way conversion and correct Unicode.

New

MAC Address Lookup

Manufacturer from the IEEE registry, block details and flags for randomised or multicast addresses.

Browser

Safe URL preview and interactive browsing.

Safe Browser

Preview a URL in a sandboxed browser with threat screening.

Popular public IPs

Well-known public DNS resolvers and anycast services. Each link opens a full geolocation, ASN and reputation report. See all well-known addresses, including root servers, time servers and CDN edges.

1.1.1.1

Cloudflare DNS

Anycast public resolver

1.0.0.1

Cloudflare DNS

Secondary resolver

1.1.1.2

Cloudflare for Families

Malware blocking

1.1.1.3

Cloudflare for Families

Malware + adult filter

8.8.8.8

Google Public DNS

Anycast public resolver

8.8.4.4

Google Public DNS

Secondary resolver

9.9.9.9

Quad9

Threat-blocking resolver, Zurich-based