Network Tools
Free tools for checking domains and servers: who owns a domain and when it expires, what its DNS records say, whether its certificate is valid, and which address you are connecting from.
All Network Tools
4 tools
DNS Lookup
Network ToolsEvery DNS record for a domain, with SPF and DMARC explained in plain English.
WHOIS Lookup
Network ToolsA domain's registrar, age, expiry date and status, straight from the registry. IP addresses too.
SSL Certificate Checker
Network ToolsWhether browsers trust a site's certificate, the days left, the names it covers and the chain.
What Is My IP
Network ToolsYour public IP address, the network it belongs to, and a lookup for any other IP.
Shortcuts MX Lookup · TXT Record Lookup · SPF Record Checker · DMARC Checker · Domain Age Checker · Domain Expiration Checker · SSL Expiry Checker · IP Address Lookup
Compare Network Tools
| Tool | Best for | Key facts |
|---|---|---|
| DNS Lookup | Every DNS record for a domain, with SPF and DMARC explained in plain English. | Sent to our server: Only the name, for the lookup; not stored Records: A, AAAA, CNAME, MX, NS, TXT, SOA, CAA, SRV, PTR Explains: SPF and DMARC |
| WHOIS Lookup | A domain's registrar, age, expiry date and status, straight from the registry. IP addresses too. | Sent to our server: Only the name, for the lookup; not stored Source: The registry itself, by RDAP or WHOIS Gives: Age, expiry, registrar, status, name servers |
| SSL Certificate Checker | Whether browsers trust a site's certificate, the days left, the names it covers and the chain. | Sent to our server: Only the host name, for the check; not stored Checks: Trust, expiry, names, chain Ports: 443 and the usual secure ports |
| What Is My IP | Your public IP address, the network it belongs to, and a lookup for any other IP. | Stored: Nothing; your address is only shown to you Shows: Your IP, network owner, reverse DNS Also: Look up any IP address |
Choosing the right network tool
Network Tools on FreeMicroTools answer the questions that come up when a website, an email or a connection misbehaves. The WHOIS Lookup reads a domain’s registration straight from its registry: the registrar, when it was registered, when it expires, its status codes and name servers, and for an IP address, the network and organisation it belongs to. The DNS Lookup shows every common record for a name, A, AAAA, CNAME, MX, NS, TXT, SOA and CAA, and explains the domain’s SPF and DMARC records in plain English. The SSL Certificate Checker reads the certificate a server presents and says whether browsers will trust it, how many days are left, which names it covers and whether the chain is complete. What Is My IP shows the address your connection comes from and the network it belongs to.
Use WHOIS before buying, renewing or transferring a domain, DNS Lookup when email lands in spam or a new record does not seem to work, the SSL Checker when a browser shows a security warning or a renewal is due, and What Is My IP when a service asks for your address or a firewall needs to let you in.
Unlike the rest of the site, these tools cannot run inside your browser, because browsers are not allowed to make DNS, WHOIS or certificate lookups themselves. The name or address you type goes to our server, which makes the lookup and sends the answer back. It is not stored, and each connection has an hourly limit so the tools stay quick for everyone.
Questions
Are these network tools free?
Yes. Every tool is free with no sign-up. Each connection may make a set number of lookups per hour, enough for normal use.
Why do these tools use your server?
Browsers cannot look up DNS records, read WHOIS data or open a raw connection to check a certificate, so our server does the lookup and returns the result. What you type is used for that lookup only and is not stored.
Where does the WHOIS data come from?
From the registry that runs the domain ending or the address block, found through the public directories published by IANA. Most registries hide personal details of domain owners, so those fields are often withheld.
How do I find out when a domain expires?
Type it into the WHOIS Lookup. The expiry date and the days left come from the registry’s own record.
Looking for something that is not here? Suggest a tool and it may well get built.