| 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": [
"172.20.139.176_29",
"172.20.139.184_29",
"172.20.229.112_29",
"172.20.54.56_29",
"172.22.158.240_29",
"172.22.159.16_29",
"172.22.159.24_29",
"172.22.159.32_29",
"172.22.189.208_29",
"172.22.189.216_29",
"172.23.168.192_29",
"172.23.168.200_29",
"172.23.173.32_29",
"172.23.38.0_29",
"172.23.38.8_29"
],
"28": [
"172.20.158.32_28",
"172.20.237.64_28",
"172.20.237.80_28",
"172.20.34.128_28",
"172.20.39.80_28",
"172.20.39.96_28",
"172.20.41.32_28",
"172.20.5.192_28",
"172.20.53.96_28",
"172.22.148.224_28",
"172.22.158.224_28",
"172.22.189.192_28",
"172.23.199.112_28",
"172.23.234.48_28",
"172.23.250.64_28"
],
"27": [
"172.20.159.32_27",
"172.20.21.96_27",
"172.20.231.224_27",
"172.20.235.128_27",
"172.20.33.96_27",
"172.21.89.32_27",
"172.22.132.192_27",
"172.22.179.64_27",
"172.22.183.0_27",
"172.23.104.32_27",
"172.23.119.128_27",
"172.23.178.0_27",
"172.23.250.32_27",
"172.23.93.0_27",
"172.23.93.32_27"
],
"26": [
"172.20.159.64_26",
"172.20.19.0_26",
"172.22.132.128_26",
"172.22.135.64_26",
"172.22.179.0_26",
"172.22.182.128_26",
"172.22.182.192_26",
"172.22.189.128_26",
"172.22.189.64_26",
"172.23.104.64_26",
"172.23.116.64_26",
"172.23.35.192_26",
"172.23.73.64_26",
"172.23.93.128_26",
"172.23.93.64_26"
],
"25": [
"172.20.164.128_25",
"172.20.21.128_25",
"172.21.100.128_25",
"172.21.99.128_25",
"172.22.135.128_25",
"172.23.104.128_25",
"172.23.159.0_25",
"172.23.159.128_25",
"172.23.160.0_25",
"172.23.160.128_25",
"172.23.161.0_25",
"172.23.189.128_25",
"172.23.193.0_25",
"172.23.213.128_25",
"172.23.67.128_25"
],
"24": [
"172.22.124.0_24",
"172.22.138.0_24",
"172.22.139.0_24",
"172.23.105.0_24",
"172.23.131.0_24",
"172.23.144.0_24",
"172.23.145.0_24",
"172.23.182.0_24",
"172.23.221.0_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",
"172.23.97.0_24"
],
"23": [
"172.20.132.0_23",
"172.20.224.0_23",
"172.21.72.0_23",
"172.22.122.0_23",
"172.22.136.0_23",
"172.23.106.0_23",
"172.23.114.0_23",
"172.23.142.0_23",
"172.23.166.0_23",
"172.23.180.0_23",
"172.23.190.0_23",
"172.23.32.0_23",
"172.23.36.0_23",
"172.23.68.0_23",
"172.23.98.0_23"
]
},
"mtime": "2019-05-22T19:07:57Z"
}