IPv4 Subnet Calculator
Common Public DNS Resolvers (IPv4)
| Cloudflare | 1.1.1.1 | 1.0.0.1 |
| Quad9 | 9.9.9.9 | 149.112.112.112 |
| 8.8.8.8 | 8.8.4.4 | |
| OpenDNS | 208.67.222.222 | 208.67.220.220 |
IPv6 Subnet Calculator
Common Public DNS Resolvers (IPv6)
| Cloudflare | 2606:4700:4700::1111 | 2606:4700:4700::1001 |
| Quad9 | 2620:fe::fe | 2620:fe::9 |
| 2001:4860:4860::8888 | 2001:4860:4860::8844 | |
| OpenDNS | 2620:119:35::35 | 2620:119:53::53 |
RAID / JBOD Calculator
Storage / RAM
Everything here updates as you type.
Convert a size
Enter a size to convert.
Binary (1024) - what Windows, Linux & RAM use
Decimal (1000) - what drive labels & macOS use
Why does a "4 TB" drive show up as 3.64 TB? The box uses decimal units, but Windows counts in binary (TiB) while still labeling it "TB". RAM is always binary: a "16 GB" stick is 16 GiB.
Add it up
Total up a server's RAM or a set of drives. Each line is quantity × size.
Compare two sizes
How much space is left, what percent is used, or how many items fit.
Enter both sizes to compare.