| 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",
"172.20.184.240_29",
"172.20.184.248_29",
"172.20.6.144_29",
"172.21.101.104_29",
"172.21.101.112_29",
"172.21.65.48_29",
"172.21.65.56_29",
"172.21.84.104_29",
"172.21.84.112_29",
"172.21.84.120_29",
"172.22.135.16_29",
"172.22.147.48_29",
"172.22.188.224_29",
"172.23.120.32_29"
],
"28": [
"172.20.150.112_28",
"172.20.158.32_28",
"172.20.20.160_28",
"172.20.53.96_28",
"172.21.87.0_28",
"172.21.87.16_28",
"172.22.134.80_28",
"172.22.134.96_28",
"172.22.158.224_28",
"172.22.98.16_28",
"172.23.120.16_28",
"172.23.131.0_28",
"172.23.183.32_28",
"172.23.222.96_28",
"172.23.43.0_28"
],
"27": [
"172.20.178.32_27",
"172.20.41.32_27",
"172.20.41.64_27",
"172.20.41.96_27",
"172.21.119.64_27",
"172.21.65.64_27",
"172.22.118.32_27",
"172.22.181.224_27",
"172.23.193.160_27",
"172.23.197.0_27",
"172.23.231.64_27",
"172.23.236.128_27",
"172.23.236.160_27",
"172.23.237.192_27",
"172.23.250.32_27"
],
"26": [
"172.20.191.64_26",
"172.21.118.128_26",
"172.21.118.192_26",
"172.21.119.0_26",
"172.22.131.64_26",
"172.22.167.128_26",
"172.22.167.192_26",
"172.22.167.64_26",
"172.23.101.192_26",
"172.23.193.192_26",
"172.23.236.192_26",
"172.23.237.0_26",
"172.23.237.128_26",
"172.23.237.64_26",
"172.23.91.128_26"
],
"25": [
"172.20.191.128_25",
"172.20.235.128_25",
"172.20.41.128_25",
"172.21.84.128_25",
"172.21.85.0_25",
"172.21.85.128_25",
"172.21.86.0_25",
"172.21.86.128_25",
"172.22.127.128_25",
"172.22.131.128_25",
"172.22.133.128_25",
"172.22.140.128_25",
"172.23.203.128_25",
"172.23.43.128_25",
"172.23.91.0_25"
],
"24": [
"172.20.19.0_24",
"172.20.236.0_24",
"172.22.124.0_24",
"172.23.109.0_24",
"172.23.176.0_24",
"172.23.182.0_24",
"172.23.206.0_24",
"172.23.207.0_24",
"172.23.221.0_24",
"172.23.44.0_24",
"172.23.50.0_24",
"172.23.51.0_24",
"172.23.89.0_24",
"172.23.90.0_24",
"172.23.93.0_24"
],
"23": [
"172.20.132.0_23",
"172.20.224.0_23",
"172.21.72.0_23",
"172.22.122.0_23",
"172.22.182.0_23",
"172.23.110.0_23",
"172.23.114.0_23",
"172.23.134.0_23",
"172.23.180.0_23",
"172.23.204.0_23",
"172.23.246.0_23",
"172.23.48.0_23",
"172.23.52.0_23",
"172.23.74.0_23",
"172.23.94.0_23"
]
},
"mtime": "2019-01-21T20:08:01Z"
}