28.2.96.0/23

Public

Class A — /23 prefix — 510 usable hosts

Network Address

28.2.96.0

Broadcast Address

28.2.97.255

Subnet Mask

255.255.254.0

Usable Hosts

510

First Usable IP

28.2.96.1

Last Usable IP

28.2.97.254

Total IPs

512

Prefix Length

/23

Network address — the base address of the block (28.2.96.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 28.2.97.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 510 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.254.0 is the dotted-decimal equivalent of /23. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	28.2.96.0/23
Network Address	28.2.96.0
Broadcast Address	28.2.97.255
Subnet Mask	255.255.254.0
Wildcard Mask	0.0.1.255
Prefix Length	/23
IP Address Class	Class A
Total IP Addresses	512
Usable Host Addresses	510
First Usable IP	28.2.96.1
Last Usable IP	28.2.97.254
Network (Hex)	0x1C026000
Broadcast (Hex)	0x1C0261FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

00011100.00000010 00011100.00000010.01100000.00000000

Subnet Mask

11111111.11111111.11111110.00000000

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

Split into Equal Subnets

Split 28.2.96.0/23 into 2 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.2.96.0/24	28.2.96.0	28.2.96.1	28.2.96.254	28.2.96.255	254
2	28.2.97.0/24	28.2.97.0	28.2.97.1	28.2.97.254	28.2.97.255	254

Split 28.2.96.0/23 into 4 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.2.96.0/25	28.2.96.0	28.2.96.1	28.2.96.126	28.2.96.127	126
2	28.2.96.128/25	28.2.96.128	28.2.96.129	28.2.96.254	28.2.96.255	126
3	28.2.97.0/25	28.2.97.0	28.2.97.1	28.2.97.126	28.2.97.127	126
4	28.2.97.128/25	28.2.97.128	28.2.97.129	28.2.97.254	28.2.97.255	126

Split 28.2.96.0/23 into 8 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.2.96.0/26	28.2.96.0	28.2.96.1	28.2.96.62	28.2.96.63	62
2	28.2.96.64/26	28.2.96.64	28.2.96.65	28.2.96.126	28.2.96.127	62
3	28.2.96.128/26	28.2.96.128	28.2.96.129	28.2.96.190	28.2.96.191	62
4	28.2.96.192/26	28.2.96.192	28.2.96.193	28.2.96.254	28.2.96.255	62
5	28.2.97.0/26	28.2.97.0	28.2.97.1	28.2.97.62	28.2.97.63	62
6	28.2.97.64/26	28.2.97.64	28.2.97.65	28.2.97.126	28.2.97.127	62
7	28.2.97.128/26	28.2.97.128	28.2.97.129	28.2.97.190	28.2.97.191	62
8	28.2.97.192/26	28.2.97.192	28.2.97.193	28.2.97.254	28.2.97.255	62

Split 28.2.96.0/23 into 16 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.2.96.0/27	28.2.96.0	28.2.96.1	28.2.96.30	28.2.96.31	30
2	28.2.96.32/27	28.2.96.32	28.2.96.33	28.2.96.62	28.2.96.63	30
3	28.2.96.64/27	28.2.96.64	28.2.96.65	28.2.96.94	28.2.96.95	30
4	28.2.96.96/27	28.2.96.96	28.2.96.97	28.2.96.126	28.2.96.127	30
5	28.2.96.128/27	28.2.96.128	28.2.96.129	28.2.96.158	28.2.96.159	30
6	28.2.96.160/27	28.2.96.160	28.2.96.161	28.2.96.190	28.2.96.191	30
7	28.2.96.192/27	28.2.96.192	28.2.96.193	28.2.96.222	28.2.96.223	30
8	28.2.96.224/27	28.2.96.224	28.2.96.225	28.2.96.254	28.2.96.255	30
9	28.2.97.0/27	28.2.97.0	28.2.97.1	28.2.97.30	28.2.97.31	30
10	28.2.97.32/27	28.2.97.32	28.2.97.33	28.2.97.62	28.2.97.63	30
11	28.2.97.64/27	28.2.97.64	28.2.97.65	28.2.97.94	28.2.97.95	30
12	28.2.97.96/27	28.2.97.96	28.2.97.97	28.2.97.126	28.2.97.127	30
13	28.2.97.128/27	28.2.97.128	28.2.97.129	28.2.97.158	28.2.97.159	30
14	28.2.97.160/27	28.2.97.160	28.2.97.161	28.2.97.190	28.2.97.191	30
15	28.2.97.192/27	28.2.97.192	28.2.97.193	28.2.97.222	28.2.97.223	30
16	28.2.97.224/27	28.2.97.224	28.2.97.225	28.2.97.254	28.2.97.255	30

/23 Subnet Reference

Total IPs 512

Usable Hosts 510

Subnet Mask 255.255.254.0

Wildcard 0.0.1.255

Full /23 reference →

Related Ranges

Parent /22 block 28.2.96.0/22 Sibling /23 block 28.2.98.0/23

Adjacent Prefix Sizes

/21 2,046 hosts /22 1,022 hosts /23 510 hosts /24 254 hosts /25 126 hosts