200.128.0.0/9

Public

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

Network Address

200.128.0.0

Broadcast Address

200.255.255.255

Subnet Mask

255.128.0.0

Usable Hosts

8,388,606

First Usable IP

200.128.0.1

Last Usable IP

200.255.255.254

Total IPs

8,388,608

Prefix Length

Network address — the base address of the block (200.128.0.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 200.255.255.255 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	200.128.0.0/9
Network Address	200.128.0.0
Broadcast Address	200.255.255.255
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	200.128.0.1
Last Usable IP	200.255.255.254
Network (Hex)	0xC8800000
Broadcast (Hex)	0xC8FFFFFF
Address Type	Public / Globally Routable

Binary Representation

Network Address

11001000 11001000.10000000.00000000.00000000

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 200.128.0.0/9 into 2 equal /10 subnets (4,194,302 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.128.0.0/10	200.128.0.0	200.128.0.1	200.191.255.254	200.191.255.255	4,194,302
2	200.192.0.0/10	200.192.0.0	200.192.0.1	200.255.255.254	200.255.255.255	4,194,302

Split 200.128.0.0/9 into 4 equal /11 subnets (2,097,150 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.128.0.0/11	200.128.0.0	200.128.0.1	200.159.255.254	200.159.255.255	2,097,150
2	200.160.0.0/11	200.160.0.0	200.160.0.1	200.191.255.254	200.191.255.255	2,097,150
3	200.192.0.0/11	200.192.0.0	200.192.0.1	200.223.255.254	200.223.255.255	2,097,150
4	200.224.0.0/11	200.224.0.0	200.224.0.1	200.255.255.254	200.255.255.255	2,097,150

Split 200.128.0.0/9 into 8 equal /12 subnets (1,048,574 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.128.0.0/12	200.128.0.0	200.128.0.1	200.143.255.254	200.143.255.255	1,048,574
2	200.144.0.0/12	200.144.0.0	200.144.0.1	200.159.255.254	200.159.255.255	1,048,574
3	200.160.0.0/12	200.160.0.0	200.160.0.1	200.175.255.254	200.175.255.255	1,048,574
4	200.176.0.0/12	200.176.0.0	200.176.0.1	200.191.255.254	200.191.255.255	1,048,574
5	200.192.0.0/12	200.192.0.0	200.192.0.1	200.207.255.254	200.207.255.255	1,048,574
6	200.208.0.0/12	200.208.0.0	200.208.0.1	200.223.255.254	200.223.255.255	1,048,574
7	200.224.0.0/12	200.224.0.0	200.224.0.1	200.239.255.254	200.239.255.255	1,048,574
8	200.240.0.0/12	200.240.0.0	200.240.0.1	200.255.255.254	200.255.255.255	1,048,574

Split 200.128.0.0/9 into 16 equal /13 subnets (524,286 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	200.128.0.0/13	200.128.0.0	200.128.0.1	200.135.255.254	200.135.255.255	524,286
2	200.136.0.0/13	200.136.0.0	200.136.0.1	200.143.255.254	200.143.255.255	524,286
3	200.144.0.0/13	200.144.0.0	200.144.0.1	200.151.255.254	200.151.255.255	524,286
4	200.152.0.0/13	200.152.0.0	200.152.0.1	200.159.255.254	200.159.255.255	524,286
5	200.160.0.0/13	200.160.0.0	200.160.0.1	200.167.255.254	200.167.255.255	524,286
6	200.168.0.0/13	200.168.0.0	200.168.0.1	200.175.255.254	200.175.255.255	524,286
7	200.176.0.0/13	200.176.0.0	200.176.0.1	200.183.255.254	200.183.255.255	524,286
8	200.184.0.0/13	200.184.0.0	200.184.0.1	200.191.255.254	200.191.255.255	524,286
9	200.192.0.0/13	200.192.0.0	200.192.0.1	200.199.255.254	200.199.255.255	524,286
10	200.200.0.0/13	200.200.0.0	200.200.0.1	200.207.255.254	200.207.255.255	524,286
11	200.208.0.0/13	200.208.0.0	200.208.0.1	200.215.255.254	200.215.255.255	524,286
12	200.216.0.0/13	200.216.0.0	200.216.0.1	200.223.255.254	200.223.255.255	524,286
13	200.224.0.0/13	200.224.0.0	200.224.0.1	200.231.255.254	200.231.255.255	524,286
14	200.232.0.0/13	200.232.0.0	200.232.0.1	200.239.255.254	200.239.255.255	524,286
15	200.240.0.0/13	200.240.0.0	200.240.0.1	200.247.255.254	200.247.255.255	524,286
16	200.248.0.0/13	200.248.0.0	200.248.0.1	200.255.255.254	200.255.255.255	524,286

/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 200.0.0.0/8 Sibling /9 block 200.0.0.0/9

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