| 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": [
"172.20.139.176_29",
"172.20.148.72_29",
"172.20.148.80_29",
"172.20.148.88_29",
"172.20.15.232_29",
"172.20.19.96_29",
"172.20.34.176_29",
"172.20.46.168_29",
"172.20.6.112_29",
"172.21.117.64_29",
"172.21.65.72_29",
"172.21.84.104_29",
"172.22.128.160_29",
"172.23.163.32_29",
"172.23.35.192_29"
],
"28": [
"172.20.132.64_28",
"172.20.163.144_28",
"172.20.239.240_28",
"172.20.41.48_28",
"172.20.48.224_28",
"172.22.128.80_28",
"172.22.149.128_28",
"172.22.151.96_28",
"172.22.157.32_28",
"172.23.119.240_28",
"172.23.124.32_28",
"172.23.190.64_28",
"172.23.234.128_28",
"172.23.234.144_28",
"172.23.57.16_28"
],
"27": [
"172.20.148.96_27",
"172.20.155.96_27",
"172.20.56.0_27",
"172.20.56.32_27",
"172.21.117.32_27",
"172.22.122.64_27",
"172.22.122.96_27",
"172.22.134.32_27",
"172.23.151.160_27",
"172.23.215.224_27",
"172.23.223.32_27",
"172.23.223.64_27",
"172.23.234.160_27",
"172.23.241.64_27",
"172.23.76.64_27"
],
"26": [
"172.20.235.128_26",
"172.20.235.192_26",
"172.20.29.64_26",
"172.20.47.192_26",
"172.21.112.64_26",
"172.22.105.128_26",
"172.22.105.64_26",
"172.22.169.64_26",
"172.22.179.0_26",
"172.22.188.64_26",
"172.23.189.128_26",
"172.23.40.128_26",
"172.23.40.192_26",
"172.23.66.0_26",
"172.23.99.192_26"
],
"25": [
"172.20.143.128_25",
"172.20.148.128_25",
"172.20.187.128_25",
"172.20.224.128_25",
"172.20.55.128_25",
"172.21.112.128_25",
"172.21.99.128_25",
"172.22.122.128_25",
"172.22.126.128_25",
"172.23.128.128_25",
"172.23.203.128_25",
"172.23.213.128_25",
"172.23.223.128_25",
"172.23.230.128_25",
"172.23.43.128_25"
],
"24": [
"172.20.225.0_24",
"172.22.123.0_24",
"172.22.96.0_24",
"172.23.129.0_24",
"172.23.131.0_24",
"172.23.144.0_24",
"172.23.206.0_24",
"172.23.210.0_24",
"172.23.217.0_24",
"172.23.221.0_24",
"172.23.224.0_24",
"172.23.32.0_24",
"172.23.44.0_24",
"172.23.65.0_24",
"172.23.93.0_24"
],
"23": [
"172.21.114.0_23",
"172.21.126.0_23",
"172.21.72.0_23",
"172.22.144.0_23",
"172.22.154.0_23",
"172.23.114.0_23",
"172.23.142.0_23",
"172.23.180.0_23",
"172.23.204.0_23",
"172.23.218.0_23",
"172.23.228.0_23",
"172.23.246.0_23",
"172.23.48.0_23",
"172.23.74.0_23",
"172.23.94.0_23"
]
},
"mtime": "2020-04-07T03:03:12Z"
}