11.31.128.192/28

Public

Class A — /28 prefix — 14 usable hosts

Network Address

11.31.128.192

Broadcast Address

11.31.128.207

Subnet Mask

255.255.255.240

Usable Hosts

First Usable IP

11.31.128.193

Last Usable IP

11.31.128.206

Total IPs

Prefix Length

/28

Network address — the base address of the block (11.31.128.192). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 11.31.128.207 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 14 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.255.240 is the dotted-decimal equivalent of /28. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	11.31.128.192/28
Network Address	11.31.128.192
Broadcast Address	11.31.128.207
Subnet Mask	255.255.255.240
Wildcard Mask	0.0.0.15
Prefix Length	/28
IP Address Class	Class A
Total IP Addresses	16
Usable Host Addresses	14
First Usable IP	11.31.128.193
Last Usable IP	11.31.128.206
Network (Hex)	0x0B1F80C0
Broadcast (Hex)	0x0B1F80CF
Address Type	Public / Globally Routable

Binary Representation

Network Address

00001011.00011111.10000000 00001011.00011111.10000000.11000000

Subnet Mask

11111111.11111111.11111111.11110000

The first 28 bits (1s in the mask) identify the network. The remaining 4 bits identify hosts within the network.

Split into Equal Subnets

Split 11.31.128.192/28 into 2 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	11.31.128.192/29	11.31.128.192	11.31.128.193	11.31.128.198	11.31.128.199	6
2	11.31.128.200/29	11.31.128.200	11.31.128.201	11.31.128.206	11.31.128.207	6

Split 11.31.128.192/28 into 4 equal /30 subnets (2 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	11.31.128.192/30	11.31.128.192	11.31.128.193	11.31.128.194	11.31.128.195	2
2	11.31.128.196/30	11.31.128.196	11.31.128.197	11.31.128.198	11.31.128.199	2
3	11.31.128.200/30	11.31.128.200	11.31.128.201	11.31.128.202	11.31.128.203	2
4	11.31.128.204/30	11.31.128.204	11.31.128.205	11.31.128.206	11.31.128.207	2

All 16 IP Addresses in this Range

11.31.128.192 net

11.31.128.193

11.31.128.194

11.31.128.195

11.31.128.196

11.31.128.197

11.31.128.198

11.31.128.199

11.31.128.200

11.31.128.201

11.31.128.202

11.31.128.203

11.31.128.204

11.31.128.205

11.31.128.206

11.31.128.207 bcast

/28 Subnet Reference

Total IPs 16

Usable Hosts 14

Subnet Mask 255.255.255.240

Wildcard 0.0.0.15

Full /28 reference →

Related Ranges

Parent /27 block 11.31.128.192/27 Sibling /28 block 11.31.128.208/28

Adjacent Prefix Sizes

/26 62 hosts /27 30 hosts /28 14 hosts /29 6 hosts /30 2 hosts