| Size | Comment |
|---|---|
| /29 | starter pack |
| /28 | usually enough |
| /27 | default allocation |
| /26 | usually enough |
| /25 | still a lot of IPs! |
| /24 | are you an organization? |
The current guideline is to allocate a /27 or smaller by default, keeping space for up to a /26 if possible. Don't allocate more than a /25 worth of addresses and please think before you allocate: If you are going to have 2-3 servers and two VPN-spaces, a /28 is enough to suit your needs. Same will go for most home-networks. This is not public internet, but our IPv4-space is valuable too! If you need a /24 or larger, please ask in the IRC chan or on the mailing list.
For example, if there is no /27 free, you can split up a /26 into two /27. If you are looking for a /27 but there are none showing in the Open Netblocks tool, instead pick one of the /26 and click Take it! When registering your inetnum, instead of writing 172.2x.xxx.0-172.2x.xxx.63 then you can write 172.2x.xxx.0-172.2x.xxx.31. This will get you a /27 and save our IP space for others.
To register for example 172.20.150.0/27, you need to fill in 172.20.150.0-172.20.150.31.
{
"prefixes": {
"29": [
"172.20.142.40_29",
"172.20.15.56_29",
"172.20.150.112_29",
"172.20.4.104_29",
"172.21.106.64_29",
"172.21.117.32_29",
"172.21.84.104_29",
"172.22.118.32_29",
"172.22.127.64_29",
"172.22.127.72_29",
"172.22.142.8_29",
"172.22.177.80_29",
"172.23.104.32_29",
"172.23.162.32_29",
"172.23.84.32_29"
],
"28": [
"172.20.142.48_28",
"172.20.154.80_28",
"172.20.158.32_28",
"172.20.160.48_28",
"172.20.165.16_28",
"172.20.172.176_28",
"172.20.18.112_28",
"172.21.84.112_28",
"172.22.125.16_28",
"172.22.127.80_28",
"172.22.188.224_28",
"172.23.250.64_28",
"172.23.34.0_28",
"172.23.43.0_28",
"172.23.91.224_28"
],
"27": [
"172.20.142.64_27",
"172.20.159.128_27",
"172.20.231.32_27",
"172.20.53.96_27",
"172.22.105.64_27",
"172.22.105.96_27",
"172.22.177.0_27",
"172.22.177.32_27",
"172.22.188.64_27",
"172.22.188.96_27",
"172.23.151.224_27",
"172.23.230.64_27",
"172.23.250.32_27",
"172.23.35.192_27",
"172.23.91.192_27"
],
"26": [
"172.20.159.64_26",
"172.20.21.128_26",
"172.20.236.128_26",
"172.20.236.64_26",
"172.20.237.64_26",
"172.21.100.128_26",
"172.22.116.64_26",
"172.22.156.192_26",
"172.22.96.0_26",
"172.23.101.192_26",
"172.23.176.0_26",
"172.23.190.64_26",
"172.23.197.0_26",
"172.23.197.64_26",
"172.23.43.128_26"
],
"25": [
"172.20.143.128_25",
"172.20.187.128_25",
"172.20.28.128_25",
"172.20.53.128_25",
"172.20.55.128_25",
"172.21.84.128_25",
"172.21.89.128_25",
"172.22.105.128_25",
"172.22.116.128_25",
"172.23.190.128_25",
"172.23.223.128_25",
"172.23.236.128_25",
"172.23.238.0_25",
"172.23.97.0_25",
"172.23.97.128_25"
],
"24": [
"172.20.29.0_24",
"172.21.85.0_24",
"172.21.86.0_24",
"172.22.108.0_24",
"172.22.109.0_24",
"172.22.124.0_24",
"172.22.179.0_24",
"172.22.180.0_24",
"172.23.144.0_24",
"172.23.145.0_24",
"172.23.191.0_24",
"172.23.210.0_24",
"172.23.221.0_24",
"172.23.224.0_24",
"172.23.237.0_24"
],
"23": [
"172.20.132.0_23",
"172.20.224.0_23",
"172.21.72.0_23",
"172.21.90.0_23",
"172.22.106.0_23",
"172.22.122.0_23",
"172.22.144.0_23",
"172.22.154.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.166.0_23",
"172.23.228.0_23",
"172.23.32.0_23",
"172.23.48.0_23",
"172.23.98.0_23"
]
},
"mtime": "2019-11-17T17:05:07Z"
}