| 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": [
"172.20.149.16_29",
"172.20.150.112_29",
"172.20.160.48_29",
"172.20.18.0_29",
"172.20.42.136_29",
"172.20.42.144_29",
"172.20.59.128_29",
"172.21.106.32_29",
"172.21.92.96_29",
"172.22.125.16_29",
"172.22.159.16_29",
"172.22.188.224_29",
"172.23.119.112_29",
"172.23.234.128_29",
"172.23.89.0_29"
],
"28": [
"172.20.135.208_28",
"172.20.149.64_28",
"172.20.149.80_28",
"172.20.6.144_28",
"172.21.92.32_28",
"172.21.92.48_28",
"172.22.134.80_28",
"172.22.135.64_28",
"172.22.135.80_28",
"172.22.158.128_28",
"172.22.179.32_28",
"172.23.100.160_28",
"172.23.131.0_28",
"172.23.183.32_28",
"172.23.183.48_28"
],
"27": [
"172.20.28.128_27",
"172.20.41.32_27",
"172.20.51.32_27",
"172.20.53.96_27",
"172.21.92.64_27",
"172.22.119.224_27",
"172.22.132.64_27",
"172.22.135.96_27",
"172.22.158.224_27",
"172.22.179.0_27",
"172.23.116.64_27",
"172.23.116.96_27",
"172.23.176.64_27",
"172.23.223.32_27",
"172.23.240.32_27"
],
"26": [
"172.20.173.64_26",
"172.20.47.64_26",
"172.20.51.64_26",
"172.20.59.64_26",
"172.21.112.0_26",
"172.21.89.0_26",
"172.22.104.0_26",
"172.22.104.128_26",
"172.22.104.64_26",
"172.22.146.128_26",
"172.22.189.64_26",
"172.23.176.0_26",
"172.23.183.64_26",
"172.23.240.64_26",
"172.23.66.0_26"
],
"25": [
"172.20.187.128_25",
"172.20.51.128_25",
"172.20.53.128_25",
"172.20.55.128_25",
"172.22.133.128_25",
"172.22.135.128_25",
"172.22.158.0_25",
"172.22.189.128_25",
"172.23.116.128_25",
"172.23.203.128_25",
"172.23.236.128_25",
"172.23.238.0_25",
"172.23.239.0_25",
"172.23.240.128_25",
"172.23.43.128_25"
],
"24": [
"172.20.188.0_24",
"172.22.124.0_24",
"172.22.138.0_24",
"172.22.139.0_24",
"172.22.156.0_24",
"172.22.157.0_24",
"172.23.117.0_24",
"172.23.206.0_24",
"172.23.207.0_24",
"172.23.210.0_24",
"172.23.230.0_24",
"172.23.237.0_24",
"172.23.241.0_24",
"172.23.244.0_24",
"172.23.44.0_24"
],
"23": [
"172.20.224.0_23",
"172.21.72.0_23",
"172.22.122.0_23",
"172.22.136.0_23",
"172.22.144.0_23",
"172.22.154.0_23",
"172.23.142.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.204.0_23",
"172.23.228.0_23",
"172.23.242.0_23",
"172.23.48.0_23",
"172.23.64.0_23",
"172.23.74.0_23"
]
},
"mtime": "2018-11-19T14:02:17Z"
}