CIDR and Useable IPs
Table of Contents
When an IP address range is assigned to a dedicated server, its done in CIDR format.
Using 138.128.17.168/30 as an example, below is a breakdown of the IP addresses in the CIDR format. The amount of IPs available will change based on the range size.
Example 138.128.17.168/30 CIDR
- 138.128.17.168 Network
- 138.128.17.169 Gateway
- 138.128.17.170 Useable
- 138.128.17.171 Useable
- 138.128.17.172 Useable
- 138.128.17.173 Useable
- 138.128.17.174 Useable
- 138.128.17.175 Broadcast
Cheat Sheet
Range Netmask Useable IPs
/30 IP Range (1 Usable IP) – Included |
/30 + /29 IP Range (9 Usable IPs) |
/30 + /28 IP Range (17 Usable IPs) |
/30 + /27 IP Range (33 Usable IPs) |
/30 + /26 IP Range (65 Usable IPs) |
/30 + /25 IP Range (129 Usable IPs) |
/30 + /24 IP Range (257 Usable IPs) |
/30 + /23 IP Range (513 Usable IPs) |
/30 + /22 IP Range (1025 Usable IPs) |
/30 + /21 IP Range (2049 Usable IPs) |
/30 + /20 IP Range (4097 Usable IPs) |