| 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": [
"172.20.168.112_29",
"172.20.183.40_29",
"172.20.184.240_29",
"172.20.19.32_29",
"172.20.237.96_29",
"172.21.113.80_29",
"172.22.130.8_29",
"172.22.158.224_29",
"172.22.98.16_29",
"172.23.151.224_29",
"172.23.197.192_29",
"172.23.222.32_29",
"172.23.223.64_29",
"172.23.248.64_29",
"172.23.250.32_29"
],
"28": [
"172.20.139.176_28",
"172.20.162.16_28",
"172.20.164.192_28",
"172.20.167.176_28",
"172.20.183.48_28",
"172.21.113.224_28",
"172.21.113.64_28",
"172.21.121.96_28",
"172.22.129.48_28",
"172.22.130.16_28",
"172.22.130.32_28",
"172.22.148.224_28",
"172.23.119.64_28",
"172.23.38.224_28",
"172.23.38.240_28"
],
"27": [
"172.20.143.128_27",
"172.20.143.160_27",
"172.20.175.32_27",
"172.20.237.64_27",
"172.21.118.128_27",
"172.22.135.64_27",
"172.22.146.128_27",
"172.22.159.32_27",
"172.23.119.32_27",
"172.23.162.32_27",
"172.23.221.0_27",
"172.23.223.32_27",
"172.23.35.192_27",
"172.23.35.224_27",
"172.23.38.192_27"
],
"26": [
"172.20.143.192_26",
"172.20.59.64_26",
"172.21.67.64_26",
"172.21.92.64_26",
"172.22.116.64_26",
"172.22.159.64_26",
"172.22.189.64_26",
"172.22.96.0_26",
"172.23.128.64_26",
"172.23.131.0_26",
"172.23.178.64_26",
"172.23.180.0_26",
"172.23.248.0_26",
"172.23.48.0_26",
"172.23.73.64_26"
],
"25": [
"172.20.12.128_25",
"172.20.48.128_25",
"172.20.55.128_25",
"172.21.79.128_25",
"172.22.116.128_25",
"172.22.120.128_25",
"172.22.149.128_25",
"172.22.159.128_25",
"172.22.189.128_25",
"172.23.178.128_25",
"172.23.193.0_25",
"172.23.203.128_25",
"172.23.213.128_25",
"172.23.38.0_25",
"172.23.43.128_25"
],
"24": [
"172.21.82.0_24",
"172.21.83.0_24",
"172.22.124.0_24",
"172.22.186.0_24",
"172.23.144.0_24",
"172.23.145.0_24",
"172.23.206.0_24",
"172.23.207.0_24",
"172.23.226.0_24",
"172.23.39.0_24",
"172.23.40.0_24",
"172.23.44.0_24",
"172.23.66.0_24",
"172.23.93.0_24",
"172.23.97.0_24"
],
"23": [
"172.20.132.0_23",
"172.21.126.0_23",
"172.21.80.0_23",
"172.22.122.0_23",
"172.22.144.0_23",
"172.23.134.0_23",
"172.23.142.0_23",
"172.23.166.0_23",
"172.23.204.0_23",
"172.23.246.0_23",
"172.23.36.0_23",
"172.23.64.0_23",
"172.23.74.0_23",
"172.23.94.0_23",
"172.23.98.0_23"
]
},
"mtime": "2019-09-20T14:02:36Z"
}