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.
#IPv4
- Privacy2 min read
What is CGNAT (carrier-grade NAT)?
Why your provider may be sharing one public IPv4 address with hundreds of customers, how to tell, and what it breaks.
- 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.