Categories · 32 tools

Network Tools

Look up DNS records, domains, IP addresses and website status. Lookups run through our server; see each tool’s badge.

DNS & domains

10

DNS Lookup

Look up A, AAAA, MX, NS, TXT, CNAME, SOA and CAA records for any domain.

DNSSEC & CAA Checker

Check whether a domain's DNSSEC validates and which certificate authorities its CAA records allow.

DNS Propagation Check

Compare how two major public resolvers answer for a DNS record.

MX Lookup

Look up the mail (MX) servers for a domain and their priorities.

Hostname to IP

Resolve a hostname to its IPv4 and IPv6 addresses.

IP to Hostname

Look up the hostname for an IPv4 address with reverse DNS (PTR).

ASN Lookup

Identify and retrieve detailed information about Autonomous System Numbers (ASN), including organization names, countries, and assigned IP ranges.

Subdomain Finder

Find known subdomains of a domain using a public host-search database.

IP Subnet Calculator

IPv4 subnet calculator: network, broadcast, masks and host range from CIDR.

CIDR & IP Range Toolkit

Merge, subtract, split and expand IPv4 and IPv6 blocks and ranges, convert ranges to CIDR, and check whether an address is in a list.

Reputation

3

IP Blacklist Check

Check whether an IPv4 address is listed on major spam and abuse DNS blacklists.

Email Blacklist Check

Check whether an email domain is on spam blacklists and has mail servers.

SPF, DKIM & DMARC Checker

Check a domain's SPF, DKIM, DMARC, MTA-STS, TLS-RPT and BIMI records and see what to fix.

Email authentication records

3

SPF Record Generator

Build an SPF record from your mail providers and IP addresses.

DMARC Record Generator

Build a DMARC policy record with report addresses and alignment settings.

DKIM Key Generator

Generate a DKIM key pair and the DNS record, in your browser.

Your connection

4

What's My IP

Find your public IP address.

IP Information

Look up the location, network and time zone of an IP address, or your own.

WebRTC Leak Test

Check which IP addresses your browser exposes through WebRTC.

User Agent Finder

Read a User-Agent string: browser, engine, operating system, device, bot or tool, and what looks inconsistent or suspicious.

Packet capture & scanning

2

tcpdump & BPF Filter Builder

Build a tcpdump capture filter and command from plain choices: hosts, networks, ports, protocols, TCP flags, ICMP types, VLANs and packet size.

Nmap Command Builder

Build an nmap command from choices (targets, scan type, ports, detection, scripts, timing, output), with what each option does and warnings. Nothing is run.

Websites

6

Website Status Checker

Check whether a website is up and how fast it responds.

Website Technologies Check

Detect common technologies a website reveals in its headers and HTML.

Analytics Tag Finder

Find the Google Analytics, Tag Manager and ad-pixel IDs a web page loads.

GTM Container Inspector

List the tags inside a public Google Tag Manager container by its GTM- ID.

Third-Party Script & Cookie Audit

List the outside hosts a page loads scripts, frames and images from, and the cookies it sets.

HTTP Methods Auditor

See which HTTP methods a server allows: probes GET, HEAD, OPTIONS and TRACE and reads the Allow header for the rest.

More

4

CT Subdomain Enumerator

List the subdomains of a domain that appear in public Certificate Transparency logs, without touching the domain itself.

Lookalike Domain Finder

List typo and look-alike versions of a domain that attackers could register, and see which ones already exist.

Passive Footprint Report

A one-page report of what a domain's public records reveal: DNS, mail policy, hosting network, registration and certificate-log names. Its web and mail servers are not contacted.

Wayback URL Harvester

List the URLs of a website that the Internet Archive has ever captured, grouped by file type, with query parameter names and hosts.

Related collections

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Website audit toolkit Privacy & security tools Domain & DNS toolkit