| 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": [
"172.20.149.72_29",
"172.20.162.16_29",
"172.20.167.128_29",
"172.20.177.64_29",
"172.20.191.128_29",
"172.20.237.80_29",
"172.21.118.176_29",
"172.22.128.192_29",
"172.22.161.112_29",
"172.22.186.80_29",
"172.23.101.224_29",
"172.23.163.160_29",
"172.23.163.64_29",
"172.23.183.240_29",
"172.23.99.192_29"
],
"28": [
"172.20.135.208_28",
"172.20.163.144_28",
"172.20.237.64_28",
"172.20.46.176_28",
"172.22.105.64_28",
"172.22.105.80_28",
"172.22.128.80_28",
"172.22.146.160_28",
"172.22.146.176_28",
"172.23.183.0_28",
"172.23.234.48_28",
"172.23.248.64_28",
"172.23.35.192_28",
"172.23.43.0_28",
"172.23.99.32_28"
],
"27": [
"172.20.135.224_27",
"172.20.164.224_27",
"172.20.165.96_27",
"172.21.75.32_27",
"172.22.128.96_27",
"172.22.146.128_27",
"172.22.159.64_27",
"172.22.177.32_27",
"172.23.162.32_27",
"172.23.173.32_27",
"172.23.183.32_27",
"172.23.250.32_27",
"172.23.38.192_27",
"172.23.73.64_27",
"172.23.73.96_27"
],
"26": [
"172.20.229.192_26",
"172.20.233.64_26",
"172.22.137.128_26",
"172.22.156.192_26",
"172.22.179.0_26",
"172.23.111.128_26",
"172.23.111.64_26",
"172.23.128.192_26",
"172.23.131.64_26",
"172.23.210.0_26",
"172.23.248.0_26",
"172.23.251.64_26",
"172.23.39.64_26",
"172.23.93.0_26",
"172.23.93.64_26"
],
"25": [
"172.20.154.128_25",
"172.20.171.128_25",
"172.20.187.128_25",
"172.20.230.128_25",
"172.20.232.128_25",
"172.20.233.128_25",
"172.20.28.128_25",
"172.21.106.128_25",
"172.21.74.128_25",
"172.21.89.128_25",
"172.21.93.128_25",
"172.22.149.128_25",
"172.23.203.128_25",
"172.23.251.128_25",
"172.23.39.128_25"
],
"24": [
"172.21.107.0_24",
"172.21.110.0_24",
"172.21.96.0_24",
"172.21.97.0_24",
"172.21.98.0_24",
"172.22.96.0_24",
"172.23.129.0_24",
"172.23.144.0_24",
"172.23.159.0_24",
"172.23.182.0_24",
"172.23.206.0_24",
"172.23.217.0_24",
"172.23.221.0_24",
"172.23.226.0_24",
"172.23.32.0_24"
],
"23": [
"172.21.108.0_23",
"172.21.126.0_23",
"172.21.72.0_23",
"172.21.90.0_23",
"172.21.94.0_23",
"172.23.114.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.154.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.204.0_23",
"172.23.218.0_23",
"172.23.246.0_23",
"172.23.48.0_23"
]
},
"mtime": "2020-07-12T06:06:35Z"
}