| 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",
"172.21.117.224_29",
"172.22.116.128_29",
"172.22.131.144_29",
"172.22.186.128_29",
"172.23.101.136_29",
"172.23.196.128_29",
"172.23.196.136_29",
"172.23.210.0_29",
"172.23.217.160_29",
"172.23.217.168_29",
"172.23.236.128_29",
"172.23.250.128_29",
"172.23.72.128_29"
],
"28": [
"172.20.183.128_28",
"172.20.183.144_28",
"172.21.107.128_28",
"172.21.76.128_28",
"172.22.155.128_28",
"172.23.120.128_28",
"172.23.120.144_28",
"172.23.120.160_28",
"172.23.124.128_28",
"172.23.196.144_28",
"172.23.36.128_28",
"172.23.36.144_28",
"172.23.57.160_28",
"172.23.57.176_28",
"172.23.75.128_28"
],
"27": [
"172.20.183.160_27",
"172.21.104.128_27",
"172.21.112.128_27",
"172.21.88.192_27",
"172.22.151.128_27",
"172.22.151.160_27",
"172.22.183.128_27",
"172.23.105.128_27",
"172.23.116.192_27",
"172.23.217.128_27",
"172.23.221.192_27",
"172.23.221.224_27",
"172.23.45.128_27",
"172.23.57.128_27",
"172.23.57.192_27"
],
"26": [
"172.20.183.192_26",
"172.21.107.64_26",
"172.21.76.64_26",
"172.21.78.192_26",
"172.21.88.128_26",
"172.22.106.128_26",
"172.22.106.192_26",
"172.22.145.128_26",
"172.22.151.192_26",
"172.23.116.128_26",
"172.23.247.128_26",
"172.23.247.192_26",
"172.23.87.128_26",
"172.23.98.128_26",
"172.23.98.192_26"
],
"25": [
"172.21.101.128_25",
"172.22.107.128_25",
"172.22.126.128_25",
"172.22.140.128_25",
"172.22.154.128_25",
"172.22.167.128_25",
"172.22.96.128_25",
"172.23.241.128_25",
"172.23.244.128_25",
"172.23.39.128_25",
"172.23.53.128_25",
"172.23.58.128_25",
"172.23.84.128_25",
"172.23.85.128_25",
"172.23.93.128_25"
],
"24": [
"172.21.119.0_24",
"172.21.124.0_24",
"172.22.136.0_24",
"172.22.139.0_24",
"172.23.115.0_24",
"172.23.127.0_24",
"172.23.129.0_24",
"172.23.144.0_24",
"172.23.166.0_24",
"172.23.176.0_24",
"172.23.191.0_24",
"172.23.204.0_24",
"172.23.65.0_24",
"172.23.70.0_24",
"172.23.74.0_24"
],
"23": [
"172.20.156.0_23",
"172.21.102.0_23",
"172.21.126.0_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": "2024-10-11T02:02:44Z"
}