IP & DNS tools
Check IPs, look up DNS records and calculate subnets. Browse 22 free tools below.
- What Is My IP AddressSee your public IP address, location and internet provider.IP & DNS
- IP Address LookupFind the location, ISP and ASN behind any IP address.IP & DNS
- DNS LookupLook up A, AAAA, MX, NS, TXT, CNAME, SOA and CAA records.IP & DNS
- DNS Propagation CheckerCompare DNS answers from Cloudflare, Google and Quad9.IP & DNS
- MX Record LookupFind a domain's mail servers in priority order.IP & DNS
- Nameserver LookupFind the authoritative nameservers for a domain.IP & DNS
- SPF Record CheckerRead and sanity-check a domain's SPF record.IP & DNS
- DMARC Record CheckerRead a domain's DMARC policy and its tags.IP & DNS
- Domain to IP ConverterResolve a domain name to its IPv4 and IPv6 addresses.IP & DNS
- Website IP LookupFind where a website's server is hosted.IP & DNS
- Reverse DNS LookupFind the hostname behind an IP address.IP & DNS
- IP Address ValidatorCheck if an address is valid, public or private.IP & DNS
- Subnet CalculatorGet network, broadcast, mask and host range from CIDR.IP & DNS
- CIDR to IP Range ConverterTurn a CIDR block into its first and last address.IP & DNS
- IP Range to CIDR ConverterCover an IP range with the fewest CIDR blocks.IP & DNS
- IP Address ConverterConvert IPv4 to decimal, hex or binary and back.IP & DNS
- Subnet Mask ConverterConvert between CIDR prefixes and dotted masks.IP & DNS
- IPv6 Expand and CompressSwitch IPv6 between full and short notation.IP & DNS
- IPv4 to IPv6 ConverterGet mapped and 6to4 forms of an IPv4 address.IP & DNS
- IP Address SorterSort IPv4 addresses in true numeric order.IP & DNS
- IP Address ExtractorPull every IPv4 address out of logs and text.IP & DNS
- What Is My BrowserSee your user agent, screen size, language and time zone.IP & DNS
About ip & dns tools
Check IPs, look up DNS records and calculate subnets. This collection has 22 free tools, including What Is My IP Address, IP Address Lookup, DNS Lookup, DNS Propagation Checker, MX Record Lookup and more. Network and DNS checks usually mean opening a terminal and remembering the right command. These tools give you the same answers in a browser, formatted so they are quick to read and share with a teammate or support team.
Lookups use well-known public services, and calculators such as subnet and CIDR tools run entirely on your device, so they also work when you are offline.
IP & DNS tools FAQ
What are ip & dns tools?
Check IPs, look up DNS records and calculate subnets. Every tool in this collection is free and needs no sign-up.
How many ip & dns tools are available?
There are 22 tools in this collection today, and new ones are added regularly.
Are these tools free?
Yes. They are free with no limits, watermarks or accounts.
Is my data private?
Calculators and converters run locally. Lookups send only the domain or IP address you enter to public services such as Cloudflare DNS, Google DNS, Quad9 and ipwho.is, and this site stores nothing.
Do the tools work on mobile?
Yes. Every tool is responsive and works in modern mobile and desktop browsers.
What can I use ip & dns tools for?
Checking DNS records after a website or email change; Finding the provider and region of an IP address; Planning subnets and address ranges; Troubleshooting email delivery with MX, SPF and DMARC.