SYSTEM TIME --:--:-- IST · 166 TOOLS LIVE · RUNS IN YOUR BROWSER — NOTHING UPLOADED
Tools / Network
NETWORK

Network Tools

15 free tools, all running entirely in your browser.

Free tools for IP address math, DNS lookups, email authentication (SPF, DMARC, blacklist checks), and domain diagnostics — covering both hands-on binary calculations and live lookups against real DNS and certificate data.

IP Address Math

NETWORK

CIDR to IP Range Calculator

Free CIDR calculator — convert CIDR notation into its network address, broadcast address, and usable IP range.
NETWORK

Subnet Mask Calculator

Convert between a CIDR prefix and a dotted-decimal subnet mask, either direction.
NETWORK

IP Address to Binary Converter

Convert an IPv4 address between dotted-decimal and binary notation, either direction.
NETWORK

MAC Address Formatter

Clean up and reformat a MAC address into colon, hyphen, or dot notation.

IP & Location

NETWORK

What Is My IP Address

Free tool to show your current public IP address, whether it’s IPv4 or IPv6, and its approximate location.
NETWORK

IP Location Lookup

Free IP address lookup — enter any IP and see its approximate location, instantly.

DNS

NETWORK

DNS Lookup

Free DNS lookup — check A, AAAA, MX, TXT, NS, CNAME, or SOA records for any domain, instantly.
NETWORK

Reverse DNS Lookup

Find the hostname associated with an IP address — a PTR record (reverse DNS) lookup.
NETWORK

DNS Propagation Checker

Check whether a DNS change has propagated across major public resolvers.

Email Security

NETWORK

SPF Record Checker

Look up and explain a domain’s SPF record — free SPF lookup and check.
NETWORK

DMARC Record Checker

Free DMARC record checker — look up and explain a domain’s DMARC policy, instantly.
NETWORK

IP / Domain Blacklist Check

Check whether an IP address or domain is listed on major spam blacklists (DNSBLs).

Domain & Site Diagnostics

NETWORK

WHOIS Lookup

Look up domain registration details — registrar, creation date, and expiry.
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SSL Certificate Expiry Checker

Free SSL certificate checker — see when a domain’s certificate expires, and who issued it.
NETWORK

HTTP Header Inspector

Free HTTP header inspector — see a URL’s response headers, security headers, and caching behavior.

Looking for something else?

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