| 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": [
"172.20.167.176_29",
"172.20.18.112_29",
"172.20.5.160_29",
"172.21.101.104_29",
"172.21.74.32_29",
"172.21.84.64_29",
"172.22.169.144_29",
"172.23.128.96_29",
"172.23.163.48_29",
"172.23.215.224_29",
"172.23.215.232_29",
"172.23.215.240_29",
"172.23.215.248_29",
"172.23.73.80_29",
"172.23.76.96_29"
],
"28": [
"172.20.149.16_28",
"172.20.158.64_28",
"172.20.158.80_28",
"172.20.172.112_28",
"172.20.235.96_28",
"172.20.47.144_28",
"172.21.125.208_28",
"172.22.149.192_28",
"172.22.149.64_28",
"172.22.169.16_28",
"172.22.169.32_28",
"172.22.169.48_28",
"172.23.100.224_28",
"172.23.163.32_28",
"172.23.73.64_28"
],
"27": [
"172.20.158.32_27",
"172.20.175.32_27",
"172.20.33.96_27",
"172.20.4.96_27",
"172.21.64.96_27",
"172.22.146.128_27",
"172.23.128.64_27",
"172.23.162.32_27",
"172.23.61.0_27",
"172.23.61.32_27",
"172.23.66.192_27",
"172.23.66.64_27",
"172.23.66.96_27",
"172.23.76.64_27",
"172.23.97.192_27"
],
"26": [
"172.20.51.64_26",
"172.20.59.64_26",
"172.22.110.64_26",
"172.22.135.64_26",
"172.22.149.128_26",
"172.23.101.192_26",
"172.23.150.64_26",
"172.23.162.64_26",
"172.23.230.64_26",
"172.23.61.64_26",
"172.23.66.0_26",
"172.23.66.128_26",
"172.23.97.0_26",
"172.23.97.128_26",
"172.23.97.64_26"
],
"25": [
"172.20.177.0_25",
"172.20.177.128_25",
"172.20.189.128_25",
"172.20.235.128_25",
"172.20.28.128_25",
"172.20.48.128_25",
"172.20.51.128_25",
"172.20.59.128_25",
"172.22.120.128_25",
"172.22.127.128_25",
"172.22.135.128_25",
"172.23.162.128_25",
"172.23.213.128_25",
"172.23.230.128_25",
"172.23.67.128_25"
],
"24": [
"172.20.19.0_24",
"172.20.236.0_24",
"172.20.29.0_24",
"172.22.138.0_24",
"172.22.139.0_24",
"172.22.179.0_24",
"172.22.180.0_24",
"172.22.96.0_24",
"172.23.109.0_24",
"172.23.131.0_24",
"172.23.178.0_24",
"172.23.182.0_24",
"172.23.70.0_24",
"172.23.71.0_24",
"172.23.72.0_24"
],
"23": [
"172.20.224.0_23",
"172.21.126.0_23",
"172.21.72.0_23",
"172.22.136.0_23",
"172.23.110.0_23",
"172.23.114.0_23",
"172.23.134.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.228.0_23",
"172.23.246.0_23",
"172.23.48.0_23",
"172.23.64.0_23",
"172.23.68.0_23",
"172.23.74.0_23"
]
},
"mtime": "2019-03-18T12:12:44Z"
}