| 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": [
"172.20.142.40_29",
"172.20.142.48_29",
"172.20.232.72_29",
"172.20.62.136_29",
"172.21.121.192_29",
"172.21.77.128_29",
"172.22.110.192_29",
"172.23.182.96_29",
"172.23.222.144_29",
"172.23.45.128_29",
"172.23.45.136_29",
"172.23.50.128_29",
"172.23.50.136_29",
"172.23.50.144_29",
"172.23.50.152_29"
],
"28": [
"172.20.135.208_28",
"172.20.44.128_28",
"172.20.47.208_28",
"172.21.107.0_28",
"172.22.131.128_28",
"172.22.161.112_28",
"172.22.182.176_28",
"172.23.111.128_28",
"172.23.240.128_28",
"172.23.241.128_28",
"172.23.241.144_28",
"172.23.45.144_28",
"172.23.45.160_28",
"172.23.86.128_28",
"172.23.86.144_28"
],
"27": [
"172.21.109.128_27",
"172.21.109.160_27",
"172.21.84.192_27",
"172.21.84.224_27",
"172.21.91.128_27",
"172.22.107.64_27",
"172.22.181.64_27",
"172.22.181.96_27",
"172.22.183.128_27",
"172.22.183.160_27",
"172.23.182.64_27",
"172.23.217.128_27",
"172.23.217.160_27",
"172.23.221.128_27",
"172.23.66.128_27"
],
"26": [
"172.20.225.192_26",
"172.21.121.128_26",
"172.21.84.128_26",
"172.22.109.192_26",
"172.22.126.128_26",
"172.22.126.192_26",
"172.22.182.192_26",
"172.22.183.192_26",
"172.23.167.64_26",
"172.23.57.128_26",
"172.23.58.128_26",
"172.23.71.128_26",
"172.23.71.192_26",
"172.23.72.128_26",
"172.23.90.128_26"
],
"25": [
"172.21.101.128_25",
"172.21.105.0_25",
"172.21.117.128_25",
"172.21.78.128_25",
"172.21.82.128_25",
"172.21.83.128_25",
"172.22.161.128_25",
"172.22.167.128_25",
"172.22.96.128_25",
"172.23.105.128_25",
"172.23.186.128_25",
"172.23.226.128_25",
"172.23.246.128_25",
"172.23.250.128_25",
"172.23.67.128_25"
],
"24": [
"172.20.133.0_24",
"172.20.179.0_24",
"172.21.104.0_24",
"172.21.119.0_24",
"172.21.124.0_24",
"172.21.95.0_24",
"172.21.98.0_24",
"172.23.106.0_24",
"172.23.115.0_24",
"172.23.144.0_24",
"172.23.166.0_24",
"172.23.176.0_24",
"172.23.68.0_24",
"172.23.70.0_24",
"172.23.74.0_24"
],
"23": [
"172.21.102.0_23",
"172.21.126.0_23",
"172.21.96.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.154.0_23",
"172.23.228.0_23"
]
},
"mtime": "2023-09-25T23:11:39Z"
}