In reply to a post by SpeedySlow:What's the difference between all these subnets? Is lower better?
Lower number = more IP addresses.
IPv4 addresses are 32 bits long. If you get a "/32" address that means that all 32 bits are set by the provider, so you only have a single address available.
A "/29" means a prefix of 29 bits from the provider, and the remaining 3 bits are for you to set. This gives 8 combinations from 000 to 111, so it's a range of 8 IP addresses.
In practice, if you use this directly on an ethernet LAN, the first and last addresses are reserved for network address and broadcast address, and one will be needed by your router, so you can connect up to 5 end devices (e.g. servers or firewalls) with unique IP addresses.
All the registries which assign IPv4 addresses have run out, so IPv4 addresses are a scarce commodity and traded at high cost on the open market.
The supposed "solution" was to replace IPv4 with IPv6, which has 128-bit addresses.
There are lots of IPv6 addresses available, and the IPv6 Internet runs in parallel with the IPv4 Internet. Unfortunately you need an IPv4 address if you want to communicate with any other device on the Internet which has only an IPv4 address - and that's almost everything.



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