| 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": [
"172.20.183.192_29",
"172.20.183.200_29",
"172.20.231.128_29",
"172.21.109.8_29",
"172.21.123.144_29",
"172.21.123.152_29",
"172.21.78.160_29",
"172.22.124.48_29",
"172.22.132.208_29",
"172.23.107.128_29",
"172.23.173.176_29",
"172.23.213.128_29",
"172.23.57.128_29",
"172.23.86.144_29",
"172.23.87.128_29"
],
"28": [
"172.20.44.128_28",
"172.21.121.128_28",
"172.21.125.208_28",
"172.21.78.128_28",
"172.21.78.144_28",
"172.22.132.192_28",
"172.22.147.192_28",
"172.22.186.160_28",
"172.22.186.176_28",
"172.23.190.128_28",
"172.23.199.128_28",
"172.23.232.224_28",
"172.23.48.128_28",
"172.23.49.192_28",
"172.23.86.128_28"
],
"27": [
"172.21.110.128_27",
"172.22.114.192_27",
"172.22.186.128_27",
"172.22.98.160_27",
"172.22.98.192_27",
"172.23.131.64_27",
"172.23.131.96_27",
"172.23.232.128_27",
"172.23.232.160_27",
"172.23.232.192_27",
"172.23.234.160_27",
"172.23.247.64_27",
"172.23.247.96_27",
"172.23.34.192_27",
"172.23.34.224_27"
],
"26": [
"172.20.183.128_26",
"172.21.78.64_26",
"172.22.114.128_26",
"172.22.149.128_26",
"172.22.168.128_26",
"172.22.168.192_26",
"172.23.178.192_26",
"172.23.186.128_26",
"172.23.186.192_26",
"172.23.190.64_26",
"172.23.34.128_26",
"172.23.43.128_26",
"172.23.43.192_26",
"172.23.85.128_26",
"172.23.85.192_26"
],
"25": [
"172.20.237.128_25",
"172.21.77.128_25",
"172.22.108.128_25",
"172.23.105.128_25",
"172.23.161.0_25",
"172.23.162.128_25",
"172.23.221.128_25",
"172.23.230.128_25",
"172.23.240.128_25",
"172.23.242.128_25",
"172.23.246.128_25",
"172.23.247.128_25",
"172.23.250.128_25",
"172.23.59.128_25",
"172.23.77.128_25"
],
"24": [
"172.21.107.0_24",
"172.21.119.0_24",
"172.21.124.0_24",
"172.21.73.0_24",
"172.21.95.0_24",
"172.21.98.0_24",
"172.23.106.0_24",
"172.23.176.0_24",
"172.23.210.0_24",
"172.23.243.0_24",
"172.23.61.0_24",
"172.23.62.0_24",
"172.23.74.0_24",
"172.23.97.0_24",
"172.23.98.0_24"
],
"23": [
"172.21.126.0_23",
"172.21.96.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.154.0_23",
"172.23.228.0_23"
]
},
"mtime": "2023-03-23T11:11:54Z"
}