| 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": [
"172.20.2.128_29",
"172.20.2.224_29",
"172.20.2.232_29",
"172.20.238.64_29",
"172.20.48.160_29",
"172.20.48.168_29",
"172.20.53.16_29",
"172.21.67.144_29",
"172.21.67.152_29",
"172.22.110.192_29",
"172.22.149.32_29",
"172.23.183.32_29",
"172.23.210.32_29",
"172.23.248.144_29",
"172.23.91.192_29"
],
"28": [
"172.20.149.64_28",
"172.20.149.80_28",
"172.20.18.112_28",
"172.20.2.240_28",
"172.20.232.32_28",
"172.20.46.128_28",
"172.20.53.0_28",
"172.21.113.64_28",
"172.21.113.80_28",
"172.21.64.64_28",
"172.21.92.64_28",
"172.22.149.64_28",
"172.23.119.128_28",
"172.23.221.0_28",
"172.23.248.128_28"
],
"27": [
"172.20.20.32_27",
"172.20.231.224_27",
"172.20.234.64_27",
"172.20.238.32_27",
"172.20.39.32_27",
"172.20.48.128_27",
"172.20.53.96_27",
"172.21.117.32_27",
"172.21.67.160_27",
"172.21.92.32_27",
"172.22.119.224_27",
"172.23.210.0_27",
"172.23.231.64_27",
"172.23.91.128_27",
"172.23.91.160_27"
],
"26": [
"172.20.2.64_26",
"172.20.228.128_26",
"172.20.237.128_26",
"172.20.237.192_26",
"172.20.237.64_26",
"172.20.39.64_26",
"172.20.46.64_26",
"172.21.117.64_26",
"172.22.110.64_26",
"172.22.131.64_26",
"172.23.158.192_26",
"172.23.159.0_26",
"172.23.159.64_26",
"172.23.236.128_26",
"172.23.73.64_26"
],
"25": [
"172.20.129.128_25",
"172.20.16.0_25",
"172.20.34.128_25",
"172.20.53.128_25",
"172.21.117.128_25",
"172.22.131.128_25",
"172.22.149.128_25",
"172.23.223.128_25",
"172.23.239.0_25",
"172.23.248.0_25",
"172.23.34.0_25",
"172.23.34.128_25",
"172.23.51.0_25",
"172.23.51.128_25",
"172.23.91.0_25"
],
"24": [
"172.21.120.0_24",
"172.21.74.0_24",
"172.21.89.0_24",
"172.22.126.0_24",
"172.23.144.0_24",
"172.23.145.0_24",
"172.23.182.0_24",
"172.23.224.0_24",
"172.23.226.0_24",
"172.23.50.0_24",
"172.23.86.0_24",
"172.23.87.0_24",
"172.23.89.0_24",
"172.23.90.0_24",
"172.23.93.0_24"
],
"23": [
"172.20.132.0_23",
"172.21.118.0_23",
"172.21.126.0_23",
"172.21.72.0_23",
"172.21.90.0_23",
"172.22.144.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.180.0_23",
"172.23.246.0_23",
"172.23.32.0_23",
"172.23.48.0_23",
"172.23.52.0_23",
"172.23.84.0_23",
"172.23.94.0_23"
]
},
"mtime": "2018-05-24T23:11:19Z"
}