| 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": [
"172.20.175.104_29",
"172.20.175.96_29",
"172.20.21.96_29",
"172.21.64.96_29",
"172.21.92.64_29",
"172.21.92.72_29",
"172.22.160.48_29",
"172.22.167.64_29",
"172.22.167.72_29",
"172.22.167.80_29",
"172.22.169.16_29",
"172.23.183.0_29",
"172.23.183.240_29",
"172.23.183.248_29",
"172.23.251.64_29"
],
"28": [
"172.20.175.112_28",
"172.20.184.240_28",
"172.20.228.208_28",
"172.20.32.64_28",
"172.20.4.112_28",
"172.20.4.96_28",
"172.21.125.208_28",
"172.21.64.16_28",
"172.22.148.224_28",
"172.22.160.32_28",
"172.23.162.32_28",
"172.23.234.48_28",
"172.23.73.64_28",
"172.23.89.0_28",
"172.23.91.192_28"
],
"27": [
"172.20.175.32_27",
"172.20.231.224_27",
"172.20.238.32_27",
"172.20.41.32_27",
"172.20.41.64_27",
"172.20.41.96_27",
"172.21.67.64_27",
"172.21.75.32_27",
"172.22.110.96_27",
"172.22.158.224_27",
"172.22.186.0_27",
"172.22.186.32_27",
"172.23.101.192_27",
"172.23.101.224_27",
"172.23.104.32_27"
],
"26": [
"172.20.2.64_26",
"172.20.34.128_26",
"172.20.55.128_26",
"172.21.106.64_26",
"172.21.75.64_26",
"172.21.89.64_26",
"172.22.186.128_26",
"172.22.186.192_26",
"172.22.186.64_26",
"172.23.176.0_26",
"172.23.190.64_26",
"172.23.230.128_26",
"172.23.230.192_26",
"172.23.230.64_26",
"172.23.231.64_26"
],
"25": [
"172.20.235.128_25",
"172.20.28.128_25",
"172.20.41.128_25",
"172.21.100.128_25",
"172.21.75.128_25",
"172.21.89.128_25",
"172.22.182.128_25",
"172.22.183.0_25",
"172.22.183.128_25",
"172.23.189.128_25",
"172.23.223.128_25",
"172.23.231.128_25",
"172.23.67.128_25",
"172.23.93.0_25",
"172.23.93.128_25"
],
"24": [
"172.20.236.0_24",
"172.20.29.0_24",
"172.21.78.0_24",
"172.22.124.0_24",
"172.22.179.0_24",
"172.22.180.0_24",
"172.22.96.0_24",
"172.23.131.0_24",
"172.23.182.0_24",
"172.23.224.0_24",
"172.23.232.0_24",
"172.23.70.0_24",
"172.23.71.0_24",
"172.23.72.0_24",
"172.23.97.0_24"
],
"23": [
"172.20.132.0_23",
"172.20.224.0_23",
"172.21.72.0_23",
"172.21.76.0_23",
"172.21.90.0_23",
"172.22.122.0_23",
"172.22.144.0_23",
"172.22.154.0_23",
"172.23.114.0_23",
"172.23.134.0_23",
"172.23.180.0_23",
"172.23.32.0_23",
"172.23.68.0_23",
"172.23.94.0_23",
"172.23.98.0_23"
]
},
"mtime": "2019-07-21T01:01:20Z"
}