| 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": [
"172.20.12.144_29",
"172.20.155.80_29",
"172.20.167.176_29",
"172.20.236.64_29",
"172.20.46.112_29",
"172.20.59.160_29",
"172.21.67.224_29",
"172.22.137.64_29",
"172.22.137.72_29",
"172.23.109.160_29",
"172.23.193.32_29",
"172.23.250.32_29",
"172.23.57.16_29",
"172.23.57.24_29",
"172.23.99.48_29"
],
"28": [
"172.20.139.176_28",
"172.20.149.16_28",
"172.20.158.192_28",
"172.20.160.48_28",
"172.20.238.160_28",
"172.20.29.96_28",
"172.20.39.80_28",
"172.22.105.96_28",
"172.23.111.64_28",
"172.23.151.160_28",
"172.23.177.0_28",
"172.23.222.128_28",
"172.23.222.144_28",
"172.23.222.160_28",
"172.23.99.32_28"
],
"27": [
"172.20.177.64_27",
"172.20.191.128_27",
"172.20.191.160_27",
"172.20.231.32_27",
"172.20.48.224_27",
"172.21.117.32_27",
"172.21.66.224_27",
"172.22.105.64_27",
"172.22.122.160_27",
"172.22.137.32_27",
"172.22.149.192_27",
"172.22.149.224_27",
"172.23.215.32_27",
"172.23.76.64_27",
"172.23.78.32_27"
],
"26": [
"172.20.187.128_26",
"172.20.187.192_26",
"172.20.224.128_26",
"172.20.224.192_26",
"172.21.89.128_26",
"172.21.89.192_26",
"172.22.101.128_26",
"172.22.116.64_26",
"172.22.122.192_26",
"172.22.128.192_26",
"172.22.149.128_26",
"172.23.223.128_26",
"172.23.223.192_26",
"172.23.241.64_26",
"172.23.73.64_26"
],
"25": [
"172.20.148.128_25",
"172.20.19.128_25",
"172.20.232.128_25",
"172.20.235.128_25",
"172.20.51.128_25",
"172.21.106.128_25",
"172.21.79.128_25",
"172.22.114.128_25",
"172.22.118.128_25",
"172.22.126.128_25",
"172.22.189.128_25",
"172.23.189.128_25",
"172.23.203.128_25",
"172.23.241.128_25",
"172.23.40.128_25"
],
"24": [
"172.20.225.0_24",
"172.21.107.0_24",
"172.21.110.0_24",
"172.22.179.0_24",
"172.22.96.0_24",
"172.23.159.0_24",
"172.23.176.0_24",
"172.23.182.0_24",
"172.23.206.0_24",
"172.23.210.0_24",
"172.23.221.0_24",
"172.23.226.0_24",
"172.23.244.0_24",
"172.23.61.0_24",
"172.23.62.0_24"
],
"23": [
"172.21.108.0_23",
"172.21.114.0_23",
"172.21.126.0_23",
"172.21.72.0_23",
"172.21.90.0_23",
"172.22.144.0_23",
"172.23.114.0_23",
"172.23.154.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.204.0_23",
"172.23.242.0_23",
"172.23.246.0_23",
"172.23.48.0_23",
"172.23.74.0_23"
]
},
"mtime": "2020-08-02T13:01:20Z"
}