IP Network Tools
All tools
IP Tools 3
DNS Tools 3
Domain Tools 1
Email DNS Tools 3
Website Diagnostics 4
Security Tools 1
Network Calculators 4

All Network Tools

19 free tools for IP, DNS, domain, email, website and security diagnostics. Calculators run entirely in your browser; lookups run at the edge and are never stored.

19 tools

Server
What Is My IP

See your public IPv4/IPv6 address, network, and connection details.

IP Tools Open
Server
IP Lookup

Look up any IP: version, type, network, registry data, and reverse DNS.

IP Tools Open
Server
DNS Lookup

Query A, AAAA, MX, TXT, NS, CNAME, SOA, CAA, SRV and PTR records.

DNS Tools Open
Server
DNS Propagation

Compare DNS answers across multiple public resolvers to spot inconsistencies.

DNS Tools Open
In browser
Subnet Calculator

Calculate network, broadcast, masks, ranges and host counts for IPv4/IPv6.

Network Calculators Open
In browser
IP Validator

Validate and classify single or bulk IPv4/IPv6 addresses — no network calls.

IP Tools Open
Server
WHOIS / RDAP

Structured registration data for domains, IPs and ASNs via RDAP.

Domain Tools Open
Server
Email DNS

Check MX, SPF, DMARC and DKIM records and get a mail-DNS health summary.

Email DNS Tools Open
Server
HTTP Headers

Inspect response status, redirect chain and HTTP headers for any public URL.

Website Diagnostics Open
Server
Security Headers

Review CSP, HSTS, and other HTTP security headers for a public URL.

Security Tools Open
Server
Reverse DNS

Find the PTR record for an IPv4 or IPv6 address.

DNS Tools Open
In browser
IP Converter

Convert IP addresses between decimal, integer, binary, hex and IPv6 forms.

Network Calculators Open
Server
SPF Checker

Parse and validate a domain’s SPF record mechanisms and qualifiers.

Email DNS Tools Open
Server
DMARC Checker

Parse a domain’s DMARC policy and explain each tag.

Email DNS Tools Open
In browser
URL Parser

Break a URL into scheme, host, port, path, query and fragment — in your browser.

Website Diagnostics Open
In browser
Hostname Validator

Validate a hostname label-by-label with IDN/Punycode analysis.

Website Diagnostics Open
Server
Response Time

Measure HTTP response time for a public URL across several samples.

Website Diagnostics Open
In browser
Base64

Encode or decode text to and from Base64 and Base64URL, with correct UTF-8 handling.

Network Calculators Open
In browser
Timestamp

Convert between Unix timestamps and human-readable UTC/local dates.

Network Calculators Open

Browse by category

IP Tools Look up, validate, convert, and inspect IPv4 and IPv6 addresses. 3 DNS Tools Query DNS records and compare answers across public resolvers. 3 Domain Tools RDAP/WHOIS registration data and domain ownership diagnostics. 1 Email DNS Tools Check MX, SPF, DMARC and DKIM records for a mail domain. 3 Website Diagnostics Inspect HTTP responses, redirect chains, headers, and response time. 4 Security Tools Review HTTP security headers and transport-security configuration. 1 Network Calculators Subnet, CIDR, and address conversion — computed in your browser. 4

About these tools

Tools marked In browser never send your input anywhere — the calculation happens locally in JavaScript. Tools marked Server need a network request (a DNS query, an RDAP lookup, or an HTTP request to a public URL); those requests run at the edge, are rate limited, and the values you enter are not written to any log or database.

Start with What Is My IP to check your own connection, DNS Lookup for records, WHOIS / RDAP for registration data, or the subnet calculator for addressing maths. Popular picks: What Is My IP Address, IP Address Lookup, DNS Lookup, DNS Propagation Checker.