This is your current public IP address, with reverse DNS, country and network details.
…
| Host name (reverse DNS) | … |
|---|---|
| Country | … |
| Network | … |
| Organization | … |
| Browser | … |
| User-Agent | … |
Note: in the current deployment this server reaches the Internet over IPv4, so your shown IP is IPv4 today. IPv6 is covered in the guides.
IP Tools
🔎IP LookupLook up registration data (RDAP/whois) and reverse DNS for any IP address.
🛰️ASN LookupFind the origin AS number, AS name, BGP route (prefix), country and RIR for any IP address. Routing data from Team Cymru.
🌐Domain WhoisDomain registration data (RDAP) and DNS records at a glance.
📇DNS LookupResolve A/AAAA/MX/NS/TXT/CNAME records, or reverse (PTR) for an IP.
🔏DNSSECChecks for DS and DNSKEY records and whether a validating resolver authenticates the zone (AD bit).
🔒SSL CheckerConnects to the server over TLS and shows the certificate's expiry, SANs, issuer, chain and TLS version. Warns when expiry is near.
🛡️HTTP HeadersFetches a URL and grades the key security headers such as HSTS, CSP and X-Frame-Options.
✉️Email AuthLooks up a domain's SPF, DMARC and DKIM records to check its anti-spoofing setup.
📡RPKI/ROAChecks ROA (Route Origin Authorization) validity for an origin ASN and prefix pair. Validation by RIPEstat.
🧮Subnet CalcCompute network, broadcast, host range and host count from CIDR. IPv4/IPv6, all in your browser.
🧰CIDR ToolsCheck CIDR membership, split a block, convert range↔CIDR, and generate curl/dig/PowerShell/ip commands for your input. All in your browser.
🔁IP ConverterConvert an IPv4 address between dotted-decimal, hex, binary and 32-bit integer. Also IPv6 expand/compress.
Guides on IP
IP Basics
What an IP address is, IPv4 structure, public/private, subnetting
IP Types & Special Addresses
Static/dynamic, unicast/multicast/broadcast/anycast, loopback and other special ranges
IPv6
IPv6 notation, differences from IPv4, transition tech (articles)
History of IP
From ARPANET to IPv4 exhaustion, the role of IANA/RIRs
Whois / RDAP / DNS
How WHOIS/RDAP works, DNS basics, reverse lookups
- How WHOIS, RDAP and DNS Work (and How They Differ)
- What Is Reverse DNS (PTR Records)?
- DNS Record Types Explained (A, AAAA, CNAME, MX, TXT, NS)
- DNSSEC Explained: Signing the DNS
- SPF, DKIM and DMARC Explained
- CAA Records: Controlling Who Can Issue Your Certificates
- DNS TTL Explained: Caching and Propagation
- What Is an ASN (Autonomous System Number)?
- BGP Routing Basics
- RPKI and ROA Explained
Linux Commands
ip, ss, netstat, dig, traceroute… old vs new commands
Windows Commands
ipconfig, netstat, and PowerShell networking cmdlets
Programming
IP fetch/validate/convert samples in Go/Python/JS/PHP/C…
Network & Security
NAT, proxies, VPNs, IP spoofing, reputation
- Proxies, VPNs and NAT: How Your IP Appears
- How to Hide My IP Address (VPN, Proxy, Tor)
- What Can Someone Find From My IP Address?
- How the SSL/TLS Certificate Chain Works
- How to Check SSL Certificate Expiry (and Never Get Caught Out)
- TLS Versions Explained: 1.0 to 1.3
- ACME and Let's Encrypt: Automatic Certificates
- HTTP Security Headers Explained
- X-Forwarded-For: Getting the Real Client IP Behind a Proxy
- CGNAT Explained: Why You Share a Public IP
- Certificate Transparency (CT) and SCTs Explained
- Certificate Revocation: OCSP, CRL and Stapling
- Can Someone Track Me by My IP Address?