| 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": [
"172.20.183.88_29",
"172.20.232.72_29",
"172.20.44.128_29",
"172.21.108.96_29",
"172.21.110.176_29",
"172.21.110.184_29",
"172.21.123.144_29",
"172.22.135.128_29",
"172.22.161.112_29",
"172.22.161.120_29",
"172.22.161.128_29",
"172.22.177.160_29",
"172.23.107.160_29",
"172.23.32.128_29",
"172.23.44.96_29"
],
"28": [
"172.20.168.112_28",
"172.20.178.176_28",
"172.20.43.128_28",
"172.21.110.160_28",
"172.21.117.64_28",
"172.21.81.64_28",
"172.22.124.16_28",
"172.22.154.128_28",
"172.22.154.144_28",
"172.22.180.192_28",
"172.22.98.128_28",
"172.23.159.64_28",
"172.23.213.128_28",
"172.23.226.128_28",
"172.23.89.224_28"
],
"27": [
"172.21.110.128_27",
"172.21.83.192_27",
"172.22.109.64_27",
"172.22.177.128_27",
"172.23.107.128_27",
"172.23.114.128_27",
"172.23.180.128_27",
"172.23.193.192_27",
"172.23.205.64_27",
"172.23.241.128_27",
"172.23.34.128_27",
"172.23.37.160_27",
"172.23.44.64_27",
"172.23.75.128_27",
"172.23.75.160_27"
],
"26": [
"172.20.232.192_26",
"172.20.237.128_26",
"172.21.75.128_26",
"172.21.75.192_26",
"172.21.83.128_26",
"172.22.147.192_26",
"172.22.157.128_26",
"172.22.183.128_26",
"172.22.183.192_26",
"172.23.180.64_26",
"172.23.34.64_26",
"172.23.59.128_26",
"172.23.59.192_26",
"172.23.66.128_26",
"172.23.75.192_26"
],
"25": [
"172.21.77.128_25",
"172.21.79.128_25",
"172.21.92.128_25",
"172.22.116.128_25",
"172.22.140.128_25",
"172.22.151.128_25",
"172.22.152.0_25",
"172.22.167.128_25",
"172.23.111.128_25",
"172.23.161.0_25",
"172.23.162.128_25",
"172.23.231.128_25",
"172.23.236.128_25",
"172.23.238.0_25",
"172.23.93.128_25"
],
"24": [
"172.20.133.0_24",
"172.21.107.0_24",
"172.21.119.0_24",
"172.21.76.0_24",
"172.21.95.0_24",
"172.23.129.0_24",
"172.23.144.0_24",
"172.23.166.0_24",
"172.23.176.0_24",
"172.23.210.0_24",
"172.23.237.0_24",
"172.23.70.0_24",
"172.23.74.0_24",
"172.23.97.0_24",
"172.23.98.0_24"
],
"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",
"172.23.94.0_23"
]
},
"mtime": "2022-12-04T05:05:51Z"
}