| 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": [
"172.20.15.224_29",
"172.20.150.112_29",
"172.20.150.120_29",
"172.20.154.96_29",
"172.20.46.168_29",
"172.21.113.224_29",
"172.21.121.128_29",
"172.22.134.32_29",
"172.22.134.40_29",
"172.22.134.48_29",
"172.22.158.224_29",
"172.22.159.16_29",
"172.22.159.24_29",
"172.22.172.96_29",
"172.23.240.32_29"
],
"28": [
"172.20.149.160_28",
"172.20.149.176_28",
"172.20.163.144_28",
"172.20.20.80_28",
"172.20.238.128_28",
"172.20.39.80_28",
"172.21.113.64_28",
"172.21.64.16_28",
"172.21.92.32_28",
"172.22.120.128_28",
"172.22.135.16_28",
"172.23.197.224_28",
"172.23.197.240_28",
"172.23.234.128_28",
"172.23.76.64_28"
],
"27": [
"172.20.154.64_27",
"172.20.168.0_27",
"172.20.20.96_27",
"172.20.227.128_27",
"172.20.227.96_27",
"172.20.234.64_27",
"172.20.238.32_27",
"172.20.28.128_27",
"172.21.64.96_27",
"172.21.89.0_27",
"172.22.130.0_27",
"172.23.163.160_27",
"172.23.178.0_27",
"172.23.197.192_27",
"172.23.91.128_27"
],
"26": [
"172.20.159.192_26",
"172.20.16.64_26",
"172.20.238.64_26",
"172.20.34.128_26",
"172.20.34.192_26",
"172.20.47.64_26",
"172.21.121.64_26",
"172.22.116.128_26",
"172.22.116.64_26",
"172.22.132.64_26",
"172.23.116.64_26",
"172.23.217.0_26",
"172.23.217.128_26",
"172.23.217.64_26",
"172.23.230.0_26"
],
"25": [
"172.20.142.0_25",
"172.20.150.128_25",
"172.20.20.128_25",
"172.20.55.128_25",
"172.21.118.128_25",
"172.22.127.128_25",
"172.22.132.128_25",
"172.22.149.128_25",
"172.23.150.0_25",
"172.23.221.0_25",
"172.23.221.128_25",
"172.23.223.128_25",
"172.23.239.0_25",
"172.23.67.128_25",
"172.23.91.0_25"
],
"24": [
"172.20.21.0_24",
"172.21.119.0_24",
"172.21.120.0_24",
"172.22.124.0_24",
"172.22.179.0_24",
"172.22.180.0_24",
"172.22.186.0_24",
"172.23.176.0_24",
"172.23.186.0_24",
"172.23.224.0_24",
"172.23.70.0_24",
"172.23.71.0_24",
"172.23.72.0_24",
"172.23.89.0_24",
"172.23.90.0_24"
],
"23": [
"172.20.224.0_23",
"172.21.126.0_23",
"172.21.72.0_23",
"172.22.122.0_23",
"172.22.144.0_23",
"172.23.114.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.228.0_23",
"172.23.254.0_23",
"172.23.32.0_23",
"172.23.64.0_23",
"172.23.68.0_23"
]
},
"mtime": "2018-09-19T17:05:14Z"
}