What Is My IP?See your public IP, location, and network at a glance IP Subnet CalculatorWork out ranges, masks, and host counts IP ConverterConvert addresses between IPv4 and IPv6 ASN LookupFind the owner and IP ranges behind an ASN IP Blacklist CheckerCheck if an IP is on spam blacklists IPv6 Website TestTest whether a site is reachable over IPv6

Port CheckerSee whether a port is open on any host DNS LookupQuery a domain's DNS records rDNS CheckLook up the reverse DNS (PTR) record for an IP Ping ToolMeasure a host's reachability and latency Speed TestCheck your download and upload speed Proxy CheckDetect whether an IP is a proxy, VPN, or TOR node Link CheckerCheck whether a URL is reachable and scan its links HTTP Headers CheckerInspect the HTTP response headers a URL returns

SPF Record CheckerValidate a domain's SPF record DMARC ValidatorCheck a domain's DMARC policy DKIM CheckerVerify a domain's DKIM signing Email Header AnalyzerParse raw email headers to trace the delivery path

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How to Spot a Spoofed Email and Stop Attackers Using Your Domain A spoofed email arrives with a From line naming someone who never touched...

Split Horizon DNS: Why Your Internal and External DNS Differ Split Horizon DNS is when one domain name returns different answers...

What Is CGNAT and Why Can't You Port Forward Anymore CGNAT (Carrier-Grade NAT) is a technique your internet provider uses to put...

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What Is My IP? IP Subnet Calculator IP Converter ASN Lookup IP Blacklist Checker IPv6 Website Test

Port Checker DNS Lookup rDNS Check Ping Tool Speed Test Proxy Check Link Checker HTTP Headers Checker

SPF Record Checker DMARC Validator DKIM Checker Email Header Analyzer

How to Spot a Spoofed Email and Stop Attackers Using Your Domain

Split Horizon DNS: Why Your Internal and External DNS Differ

What Is CGNAT and Why Can't You Port Forward Anymore All articles

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Illustration of a digital network with interconnected nodes and glowing pathways representing DNS server address lookup and internet connectivity.

How to Find Your DNS Server Address

7 min read

Router directing incoming internet traffic through an open port to a local network device, illustrating port forwarding

How Port Forwarding Works: The Ultimate Guide

10 min read

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