| 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": [
"172.20.15.56_29",
"172.20.160.48_29",
"172.20.227.112_29",
"172.20.4.104_29",
"172.20.4.112_29",
"172.22.160.48_29",
"172.22.160.56_29",
"172.22.161.80_29",
"172.23.111.32_29",
"172.23.111.40_29",
"172.23.119.240_29",
"172.23.160.96_29",
"172.23.199.112_29",
"172.23.91.192_29",
"172.23.91.200_29"
],
"28": [
"172.20.159.64_28",
"172.20.177.32_28",
"172.20.184.32_28",
"172.20.48.224_28",
"172.21.79.80_28",
"172.21.93.32_28",
"172.22.132.80_28",
"172.22.134.80_28",
"172.22.134.96_28",
"172.22.177.0_28",
"172.22.177.16_28",
"172.23.183.0_28",
"172.23.193.160_28",
"172.23.193.176_28",
"172.23.43.0_28"
],
"27": [
"172.20.229.160_27",
"172.20.229.192_27",
"172.20.229.224_27",
"172.20.48.128_27",
"172.20.51.96_27",
"172.21.75.32_27",
"172.21.92.64_27",
"172.23.109.160_27",
"172.23.160.64_27",
"172.23.163.160_27",
"172.23.183.32_27",
"172.23.183.64_27",
"172.23.193.192_27",
"172.23.193.224_27",
"172.23.76.64_27"
],
"26": [
"172.20.224.64_26",
"172.20.236.64_26",
"172.22.114.64_26",
"172.22.116.64_26",
"172.22.156.192_26",
"172.22.160.64_26",
"172.22.167.128_26",
"172.22.167.64_26",
"172.23.104.128_26",
"172.23.104.64_26",
"172.23.109.192_26",
"172.23.190.64_26",
"172.23.210.0_26",
"172.23.230.64_26",
"172.23.73.64_26"
],
"25": [
"172.20.143.128_25",
"172.20.191.128_25",
"172.20.224.128_25",
"172.20.236.128_25",
"172.20.28.128_25",
"172.20.51.128_25",
"172.21.89.128_25",
"172.22.156.0_25",
"172.23.190.128_25",
"172.23.193.0_25",
"172.23.213.128_25",
"172.23.230.128_25",
"172.23.40.128_25",
"172.23.43.128_25",
"172.23.67.128_25"
],
"24": [
"172.20.225.0_24",
"172.20.29.0_24",
"172.23.110.0_24",
"172.23.159.0_24",
"172.23.182.0_24",
"172.23.191.0_24",
"172.23.34.0_24",
"172.23.44.0_24",
"172.23.66.0_24",
"172.23.70.0_24",
"172.23.71.0_24",
"172.23.72.0_24",
"172.23.89.0_24",
"172.23.90.0_24",
"172.23.93.0_24"
],
"23": [
"172.21.114.0_23",
"172.21.90.0_23",
"172.22.144.0_23",
"172.22.154.0_23",
"172.23.134.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.228.0_23",
"172.23.246.0_23",
"172.23.32.0_23",
"172.23.48.0_23",
"172.23.64.0_23",
"172.23.68.0_23",
"172.23.74.0_23",
"172.23.94.0_23"
]
},
"mtime": "2020-01-25T02:02:13Z"
}