IP addresses1 min read
What is a subnet mask?
Why 255.255.255.0 and /24 are the same thing, how a mask separates network from host, and what wildcard masks are.
IP addresses
How addressing on the internet works.
- IP addresses1 min read
How to find your public IP address
The fastest way, and how to find both your public and your private address on Windows, macOS, iPhone, Android and your router.
- IP addresses2 min read
Why does my IP address change?
Dynamic leases, router restarts, mobile networks and IPv6 privacy addresses: the everyday reasons your IP isn't constant.
- IP addresses2 min read
Public vs private IP addresses
Why your laptop's address starts with 192.168 while websites see something else — and what that means for connectivity and privacy.
- IP addresses2 min read
CIDR and subnets, explained with examples
What /24 means, how to calculate network and broadcast addresses, and how to split a network into subnets — without memorising tables.
- IP addresses2 min read
IPv4 vs IPv6: what actually changes
Address size is the headline, but the real differences are in how networks are numbered, how devices configure themselves, and what happens to NAT.
- IP addresses2 min read
What is an IP address?
The number that identifies your connection on the internet — what it is, who assigns it, and what it does and doesn't reveal about you.