Network Tools
When a website will not load, email stops arriving or a server seems slow, the first job is to find out where the problem sits. These tools answer the basic questions from outside your own network: is the site up, what IP address does the name resolve to, which mail servers handle the domain, and is the port you need actually open.
Start with the Website Status Checker or Ping to confirm whether a host responds at all. Use DNS Lookup and Hostname to IP to see where a domain points, and MX Lookup when mail is the problem. IP Information and IP to Hostname tell you who is behind an address, and the IP Subnet Calculator helps when you are planning or reading network ranges.
Guides for these tools
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DNS Lookup Tool: How to Check DNS Records Fast
Learn how to check DNS records for any domain using a DNS lookup tool. Step-by-step guide with tips, fixes, and a fast online solution.
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DNS Records Explained: A Practical Guide to A, AAAA, MX, TXT and CNAME
What A, AAAA, MX, TXT and CNAME records actually do, in plain language, with the tools to check any domain's records in seconds.
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Is the Website Down? How to Actually Check, Step by Step
A step-by-step way to figure out whether a site is down for everyone or just for you, and what each result actually tells you.
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Public vs Private IP Address: What "What's My IP" Actually Shows You
The difference between the public IP address websites see and the private address your device uses at home, and what an IP lookup can and cannot reveal.