// HUB / NETWORK
IP & Network Tools
Free tools for inspecting any IP address or domain: see your own IP, geolocate an address, resolve DNS records, look up WHOIS registration, and check spam blocklists.
// Tools in this section
// How IP addresses and network records fit together
Every device that talks to the internet does so through an IP address, and every domain name ultimately resolves to one. The tools in this section let you inspect both ends of that relationship: what your own connection exposes, who owns a given address, what records a domain publishes, and whether an address has picked up a bad reputation.
Start with your own connection. What Is My IP shows the public IPv4 and IPv6 addresses websites see when you visit them, along with the ISP and approximate location derived from them. That is the same information any site you load can collect without asking you.
To investigate someone else's address — a suspicious login in a server log, the source of an email, an unfamiliar host — IP Lookup returns the country, region and city a geolocation database associates with it, plus the ASN and the network operator. Geolocation describes the network, not the person: country-level results are reliable, city-level results are roughly 50–80% accurate, and no lookup can produce a name or a street address.
Domains work through DNS. The DNS & WHOIS tool resolves the records a domain publishes — A and AAAA for addresses, MX for mail, NS for name servers, TXT for verification and policy such as SPF — and pulls registration data over RDAP, the structured successor to WHOIS, showing the registrar, status and key dates.
Finally, reputation. Mail servers consult DNS blocklists (DNSBLs) before accepting a message, and an address that appears on one can have its email silently rejected. The Blacklist Check queries eight public DNSBLs at once, which is usually the fastest explanation for mail that disappears without a bounce.
// Frequently asked questions
- Which tool should I use to investigate a suspicious IP address?
- Start with IP Lookup for ownership, network and location, then run the same address through the Blacklist Check to see whether it has been reported for spam or abuse. If you have a hostname rather than an address, resolve it with the DNS tool first.
- What is the difference between my public and private IP address?
- Your public IP is assigned by your ISP and is what the internet sees. Your private IP — typically 192.168.x.x or 10.x.x.x — exists only on your local network, is handed out by your router, and cannot be reached from outside it.
- Is IP geolocation accurate enough to find someone?
- No. It maps the network block an address belongs to, which often resolves to an ISP's regional hub rather than the user's town. It cannot identify an individual — connecting an address to a subscriber requires the ISP and a legal process.
- What is the difference between DNS and WHOIS?
- DNS tells you where a domain points right now: which servers handle its web traffic and its email. WHOIS, and its modern replacement RDAP, tells you about the registration itself — which registrar holds it, when it was created, and when it expires.
- Why is my email being rejected even though my mail server is configured correctly?
- A blocklist listing is a common cause. Run the Blacklist Check on your sending IP address; if it is listed, fix the underlying abuse or misconfiguration first, then follow that provider's delisting process.