151.2.34.0/23

Public

Class B — /23 prefix — 510 usable hosts

Network Address

151.2.34.0

Broadcast Address

151.2.35.255

Subnet Mask

255.255.254.0

Usable Hosts

510

First Usable IP

151.2.34.1

Last Usable IP

151.2.35.254

Total IPs

512

Prefix Length

/23

Network address — the base address of the block (151.2.34.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 151.2.35.255 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	151.2.34.0/23
Network Address	151.2.34.0
Broadcast Address	151.2.35.255
Subnet Mask	255.255.254.0
Wildcard Mask	0.0.1.255
Prefix Length	/23
IP Address Class	Class B
Total IP Addresses	512
Usable Host Addresses	510
First Usable IP	151.2.34.1
Last Usable IP	151.2.35.254
Network (Hex)	0x97022200
Broadcast (Hex)	0x970223FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

10010111.00000010 10010111.00000010.00100010.00000000

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 151.2.34.0/23 into 2 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.34.0/24	151.2.34.0	151.2.34.1	151.2.34.254	151.2.34.255	254
2	151.2.35.0/24	151.2.35.0	151.2.35.1	151.2.35.254	151.2.35.255	254

Split 151.2.34.0/23 into 4 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.34.0/25	151.2.34.0	151.2.34.1	151.2.34.126	151.2.34.127	126
2	151.2.34.128/25	151.2.34.128	151.2.34.129	151.2.34.254	151.2.34.255	126
3	151.2.35.0/25	151.2.35.0	151.2.35.1	151.2.35.126	151.2.35.127	126
4	151.2.35.128/25	151.2.35.128	151.2.35.129	151.2.35.254	151.2.35.255	126

Split 151.2.34.0/23 into 8 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.34.0/26	151.2.34.0	151.2.34.1	151.2.34.62	151.2.34.63	62
2	151.2.34.64/26	151.2.34.64	151.2.34.65	151.2.34.126	151.2.34.127	62
3	151.2.34.128/26	151.2.34.128	151.2.34.129	151.2.34.190	151.2.34.191	62
4	151.2.34.192/26	151.2.34.192	151.2.34.193	151.2.34.254	151.2.34.255	62
5	151.2.35.0/26	151.2.35.0	151.2.35.1	151.2.35.62	151.2.35.63	62
6	151.2.35.64/26	151.2.35.64	151.2.35.65	151.2.35.126	151.2.35.127	62
7	151.2.35.128/26	151.2.35.128	151.2.35.129	151.2.35.190	151.2.35.191	62
8	151.2.35.192/26	151.2.35.192	151.2.35.193	151.2.35.254	151.2.35.255	62

Split 151.2.34.0/23 into 16 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.34.0/27	151.2.34.0	151.2.34.1	151.2.34.30	151.2.34.31	30
2	151.2.34.32/27	151.2.34.32	151.2.34.33	151.2.34.62	151.2.34.63	30
3	151.2.34.64/27	151.2.34.64	151.2.34.65	151.2.34.94	151.2.34.95	30
4	151.2.34.96/27	151.2.34.96	151.2.34.97	151.2.34.126	151.2.34.127	30
5	151.2.34.128/27	151.2.34.128	151.2.34.129	151.2.34.158	151.2.34.159	30
6	151.2.34.160/27	151.2.34.160	151.2.34.161	151.2.34.190	151.2.34.191	30
7	151.2.34.192/27	151.2.34.192	151.2.34.193	151.2.34.222	151.2.34.223	30
8	151.2.34.224/27	151.2.34.224	151.2.34.225	151.2.34.254	151.2.34.255	30
9	151.2.35.0/27	151.2.35.0	151.2.35.1	151.2.35.30	151.2.35.31	30
10	151.2.35.32/27	151.2.35.32	151.2.35.33	151.2.35.62	151.2.35.63	30
11	151.2.35.64/27	151.2.35.64	151.2.35.65	151.2.35.94	151.2.35.95	30
12	151.2.35.96/27	151.2.35.96	151.2.35.97	151.2.35.126	151.2.35.127	30
13	151.2.35.128/27	151.2.35.128	151.2.35.129	151.2.35.158	151.2.35.159	30
14	151.2.35.160/27	151.2.35.160	151.2.35.161	151.2.35.190	151.2.35.191	30
15	151.2.35.192/27	151.2.35.192	151.2.35.193	151.2.35.222	151.2.35.223	30
16	151.2.35.224/27	151.2.35.224	151.2.35.225	151.2.35.254	151.2.35.255	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 151.2.32.0/22 Sibling /23 block 151.2.32.0/23

Adjacent Prefix Sizes

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