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": [ "172.20.183.192_29", "172.20.183.200_29", "172.20.231.128_29", "172.21.109.8_29", "172.21.123.144_29", "172.21.123.152_29", "172.21.78.160_29", "172.22.124.48_29", "172.22.132.208_29", "172.23.107.128_29", "172.23.173.176_29", "172.23.213.128_29", "172.23.57.128_29", "172.23.86.144_29", "172.23.87.128_29" ], "28": [ "172.20.44.128_28", "172.21.121.128_28", "172.21.125.208_28", "172.21.78.128_28", "172.21.78.144_28", "172.22.132.192_28", "172.22.147.192_28", "172.22.186.160_28", "172.22.186.176_28", "172.23.190.128_28", "172.23.199.128_28", "172.23.232.224_28", "172.23.48.128_28", "172.23.49.192_28", "172.23.86.128_28" ], "27": [ "172.21.110.128_27", "172.22.114.192_27", "172.22.186.128_27", "172.22.98.160_27", "172.22.98.192_27", "172.23.131.64_27", "172.23.131.96_27", "172.23.232.128_27", "172.23.232.160_27", "172.23.232.192_27", "172.23.234.160_27", "172.23.247.64_27", "172.23.247.96_27", "172.23.34.192_27", "172.23.34.224_27" ], "26": [ "172.20.183.128_26", "172.21.78.64_26", "172.22.114.128_26", "172.22.149.128_26", "172.22.168.128_26", "172.22.168.192_26", "172.23.178.192_26", "172.23.186.128_26", "172.23.186.192_26", "172.23.190.64_26", "172.23.34.128_26", "172.23.43.128_26", "172.23.43.192_26", "172.23.85.128_26", "172.23.85.192_26" ], "25": [ "172.20.237.128_25", "172.21.77.128_25", "172.22.108.128_25", "172.23.105.128_25", "172.23.161.0_25", "172.23.162.128_25", "172.23.221.128_25", "172.23.230.128_25", "172.23.240.128_25", "172.23.242.128_25", "172.23.246.128_25", "172.23.247.128_25", "172.23.250.128_25", "172.23.59.128_25", "172.23.77.128_25" ], "24": [ "172.21.107.0_24", "172.21.119.0_24", "172.21.124.0_24", "172.21.73.0_24", "172.21.95.0_24", "172.21.98.0_24", "172.23.106.0_24", "172.23.176.0_24", "172.23.210.0_24", "172.23.243.0_24", "172.23.61.0_24", "172.23.62.0_24", "172.23.74.0_24", "172.23.97.0_24", "172.23.98.0_24" ], "23": [ "172.21.126.0_23", "172.21.96.0_23", "172.23.134.0_23", "172.23.142.0_23", "172.23.154.0_23", "172.23.228.0_23" ] }, "mtime": "2023-03-23T11:11:54Z" }