IPRangeExplorer

204.0.0.0/9

Public

Class C — /9 prefix — 8,388,606 usable hosts

Network Address
204.0.0.0
Broadcast Address
204.127.255.255
Subnet Mask
255.128.0.0
Usable Hosts
8,388,606
First Usable IP
204.0.0.1
Last Usable IP
204.127.255.254
Total IPs
8,388,608
Prefix Length
/9

Network address — the base address of the block (204.0.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 204.127.255.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 8,388,606 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.128.0.0 is the dotted-decimal equivalent of /9. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation 204.0.0.0/9
Network Address 204.0.0.0
Broadcast Address 204.127.255.255
Subnet Mask 255.128.0.0
Wildcard Mask 0.127.255.255
Prefix Length /9
IP Address Class Class C
Total IP Addresses 8,388,608
Usable Host Addresses 8,388,606
First Usable IP 204.0.0.1
Last Usable IP 204.127.255.254
Network (Hex) 0xCC000000
Broadcast (Hex) 0xCC7FFFFF
Address Type Public / Globally Routable

Binary Representation

Network Address
11001100 11001100.00000000.00000000.00000000
Subnet Mask
11111111.10000000.00000000.00000000

The first 9 bits (1s in the mask) identify the network. The remaining 23 bits identify hosts within the network.

Split into Equal Subnets

Split 204.0.0.0/9 into 2 equal /10 subnets (4,194,302 usable hosts each).

# CIDR Network First Usable Last Usable Broadcast Hosts
1 204.0.0.0/10 204.0.0.0 204.0.0.1 204.63.255.254 204.63.255.255 4,194,302
2 204.64.0.0/10 204.64.0.0 204.64.0.1 204.127.255.254 204.127.255.255 4,194,302

/9 Subnet Reference

Total IPs 8,388,608
Usable Hosts 8,388,606
Subnet Mask 255.128.0.0
Wildcard 0.127.255.255
Full /9 reference →

Related Ranges

Parent /8 block 204.0.0.0/8 Sibling /9 block 204.128.0.0/9

Adjacent Prefix Sizes

/7 33,554,430 hosts /8 16,777,214 hosts /9 8,388,606 hosts /10 4,194,302 hosts /11 2,097,150 hosts

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