guest@ipterm:~$ ls guides/

Guides

Short, plain-language answers to common questions about IP addresses and the networks behind them.

• How to find your router's IP address

  Find your router's IP address (default gateway) on Windows, Mac, Linux, iPhone and Android, plus the most common default addresses and what to do if you can't log in.

• Private IP address ranges explained

  What 10.x.x.x, 172.16–31.x.x and 192.168.x.x addresses are, why they cannot be located, and the other special ranges you will see: loopback, link-local, carrier-grade NAT and documentation.

• What your IP address reveals (and what it doesn’t)

  What a website can learn from your IP address: your provider and an approximate location. What it cannot: your name, street address or browsing history. Plus how dynamic IPs, CGNAT and VPNs change the picture.

• IPv4 vs IPv6: what’s the difference?

  How IPv4 and IPv6 addresses differ, why IPv4 ran out, how to read shortened IPv6 addresses, and which one your connection is using.

• What is an ASN (autonomous system number)?

  An ASN identifies a network on the internet, such as an ISP or cloud provider. Learn how ASNs and BGP route traffic, who assigns them, and how to look one up.

• Subnet mask cheat sheet: CIDR to netmask

  Every IPv4 prefix from /8 to /32 with its subnet mask, wildcard mask, total addresses and usable hosts, plus how CIDR notation works and common IPv6 prefix sizes.