NetNow — Free Online Network Tools

Check IP, DNS lookup, SSL certificate, Whois, HTTP headers, and 20+ network diagnostic tools. All processing in your browser.

Millisecond Response

Data via Public APIs

100% Free

IP Tools

My IP

Check your public IP address with location, ISP, and ASN details

IP Lookup

Look up IP address geolocation, ISP, and other details

IP Blacklist Check

Check if an IP address is listed on known blacklists

DNS Tools

DNS Lookup

Query DNS records: A, AAAA, MX, CNAME, NS, TXT, SOA

Reverse DNS

Find the domain name associated with an IP address

DNS Propagation

Check DNS records from multiple global servers

DNS Blacklist

Check if a domain is listed on spam blacklists

ASN Lookup

Find the autonomous system number for an IP

HTTP Tools

HTTP Status Check

Check HTTP response status code and server info

HTTP Headers

Inspect HTTP response headers in detail

Redirect Tracer

Trace HTTP redirect chain from source to destination

User-Agent Parser

Parse and analyze any User-Agent string

SSL/TLS Tools

SSL Checker

Check SSL certificate validity and details

SSL Chain

View the complete SSL certificate chain

SSL Protocol

Check supported TLS protocol versions

Whois & Domain

Whois Lookup

Look up domain registration information

Security Tools

Security Headers

Analyze website security headers

Pwned Check

Check if your password has been leaked

Reference

HTTP Status Codes

Reference guide for all HTTP status codes

Port Reference

Common port numbers and their uses

MIME Types

Reference for common MIME content types

Free Tools