LookupThis

All Tools.

81+ free tools — no login, no limits.

DNS Tools9Email Tools8IP Tools20Security Tools4Network Tools4Developer Tools12Designer Tools4Webmaster Tools5Productivity Tools15
DNS Tools9 tools

DNS lookup, WHOIS, nameserver checks, propagation, DNSSEC, and more. Free domain diagnostic tools with plain-English explanations.

DNS Lookup
See every DNS record for a domain, explained clearly.
WHOIS Lookup
Registration details for any domain.
NS Lookup
Find which DNS provider hosts a domain.
CNAME Lookup
Find CNAME aliases for a domain.
DNS Propagation Checker
Check if DNS changes have propagated globally.
DNS Health Checker
Get a complete DNS health report.
DNS Validation
Validate your DNS records against best practices.
DNSKEY Lookup
Check DNSSEC signing keys for a domain.
DS Record Lookup
Verify DNSSEC delegation signer records.
Email Tools8 tools

Check MX records, SPF, DKIM, DMARC, BIMI, SMTP, and email headers. Free email diagnostic and authentication tools.

MX Lookup
See where a domain's email is delivered.
SPF Checker
Validate your domain's SPF record.
DKIM Checker
Verify email signing for a domain.
DMARC Checker
Check your domain's email authentication policy.
DMARC Generator
Generate a DMARC record for your domain.
BIMI Checker
Verify your brand logo appears in email inboxes.
SMTP Test
Test email server connectivity.
Email Header Analyzer
Trace the path of any email.
IP Tools20 tools

IP lookup, geolocation, WHOIS, blacklist check, IPv6 tools, subnet calculator, and more.

IP Lookup
Look up any IP address.
Reverse DNS Lookup
Map an IP address back to a hostname.
What Is My IP
See your public IP address.
IP Location Lookup
Find the location of any IP address.
IP Blacklist Checker
Check if an IP is blacklisted.
IP WHOIS Lookup
Find who owns an IP address.
IP to Decimal Converter
Convert between IP and decimal formats.
Website to IP Lookup
Find the IP address behind any website.
What Is My ISP
Find your internet service provider.
IPv4 to IPv6 Converter
Convert IPv4 addresses to IPv6 format.
IPv6 to IPv4 Converter
Convert IPv6 back to IPv4 format.
IPv6 Compression Tool
Compress an IPv6 address to short form.
IPv6 Expand Tool
Expand a short IPv6 to full form.
IPv6 CIDR to Range
Convert IPv6 CIDR to address range.
IPv6 Range to CIDR
Convert an address range to CIDR.
IPv6 Compatibility Checker
Check if a domain supports IPv6.
IPv6 Address Generator
Generate IPv6 addresses for local use.
Subnet Calculator
Calculate network subnets and ranges.
Ping Tool
Ping any host from around the world.
Traceroute
Trace the network path to any host.
Security Tools4 tools

SSL certificate checker, password generator, strength tester, and encryption tools.

SSL Checker
Check any domain's certificate and HTTPS setup.
Password Generator
Generate secure random passwords.
Password Strength Checker
Check how strong your password is.
Password Encryption
Hash text with common algorithms.
Network Tools4 tools

Port scanner, MAC address lookup, ASN lookup, and network diagnostic tools.

Port Checker
Check open ports on any host.
MAC Address Lookup
Find the vendor behind a MAC address.
MAC Address Generator
Generate random MAC addresses.
ASN Lookup
Find details for any AS number.
Developer Tools12 tools

HTTP headers, JSON formatter, hash generators, binary converters, and more developer utilities.

HTTP Headers Checker
Inspect HTTP response headers for any URL.
Website OS Checker
Detect server OS and web software.
JSON Formatter
Format, validate, and minify JSON.
MD5 & Base64 Generator
Hash and encode text instantly.
Binary to Text
Convert binary to readable text.
Text to Binary
Convert text to binary format.
.htaccess Generator
Generate Apache redirect rules.
URL Rewrite Generator
Generate SEO-friendly URL rules.
Open Graph Generator
Generate social media meta tags.
Multi URL Opener
Open multiple URLs in new tabs.
Broken Links Checker
Find dead links on any website.
RAID Calculator
Calculate RAID array capacity.
Designer Tools4 tools

Color conversion tools — RGB, HEX, CMYK, and HSV to Pantone converters.

RGB to Pantone
Convert RGB to Pantone colors.
HEX to Pantone
Convert HEX to Pantone colors.
CMYK to Pantone
Convert CMYK to Pantone colors.
HSV to Pantone
Convert HSV to Pantone colors.
Webmaster Tools5 tools

Link analyzer, user agent checker, SERP simulator, robots.txt generator, and Punycode converter.

Website Link Analyzer
Analyze all links on any webpage.
User Agent Checker
See your browser's user agent.
Punycode Converter
Convert between IDN and Punycode.
SERP Simulator
Preview your Google search listing.
Robots.txt Generator
Generate a robots.txt file.
Productivity Tools15 tools

QR codes, text tools, calculators, encoders, and everyday utilities.

QR Code Generator
Generate QR codes for anything.
QR Scanner
Scan any QR code.
Lorem Ipsum Generator
Generate placeholder text.
Time Card Calculator
Calculate work hours and overtime.
Word Counter
Count words and characters.
Online Notepad
A simple text editor in your browser.
Small Text Generator
Convert text to small characters.
ROT13 Encoder/Decoder
Encode and decode ROT13 text.
Morse Code Translator
Translate text to and from Morse code.
Domain Name Search
Check if a domain name is available.
Reverse Image Search
Find where an image appears online.
Username Checker
Check username availability everywhere.
Credit Card Validator
Check if a card number is valid.
BIN Checker
Look up bank identification numbers.
Image to Text (OCR)
Extract text from any image.