251.72.110.0/23

Public

Class E (Reserved) — /23 prefix — 510 usable hosts

Network Address

251.72.110.0

Broadcast Address

251.72.111.255

Subnet Mask

255.255.254.0

Usable Hosts

510

First Usable IP

251.72.110.1

Last Usable IP

251.72.111.254

Total IPs

512

Prefix Length

/23

Network address — the base address of the block (251.72.110.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 251.72.111.255 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	251.72.110.0/23
Network Address	251.72.110.0
Broadcast Address	251.72.111.255
Subnet Mask	255.255.254.0
Wildcard Mask	0.0.1.255
Prefix Length	/23
IP Address Class	Class E (Reserved)
Total IP Addresses	512
Usable Host Addresses	510
First Usable IP	251.72.110.1
Last Usable IP	251.72.111.254
Network (Hex)	0xFB486E00
Broadcast (Hex)	0xFB486FFF
Address Type	Public / Globally Routable

Binary Representation

Network Address

11111011.01001000 11111011.01001000.01101110.00000000

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 251.72.110.0/23 into 2 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	251.72.110.0/24	251.72.110.0	251.72.110.1	251.72.110.254	251.72.110.255	254
2	251.72.111.0/24	251.72.111.0	251.72.111.1	251.72.111.254	251.72.111.255	254

Split 251.72.110.0/23 into 4 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	251.72.110.0/25	251.72.110.0	251.72.110.1	251.72.110.126	251.72.110.127	126
2	251.72.110.128/25	251.72.110.128	251.72.110.129	251.72.110.254	251.72.110.255	126
3	251.72.111.0/25	251.72.111.0	251.72.111.1	251.72.111.126	251.72.111.127	126
4	251.72.111.128/25	251.72.111.128	251.72.111.129	251.72.111.254	251.72.111.255	126

Split 251.72.110.0/23 into 8 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	251.72.110.0/26	251.72.110.0	251.72.110.1	251.72.110.62	251.72.110.63	62
2	251.72.110.64/26	251.72.110.64	251.72.110.65	251.72.110.126	251.72.110.127	62
3	251.72.110.128/26	251.72.110.128	251.72.110.129	251.72.110.190	251.72.110.191	62
4	251.72.110.192/26	251.72.110.192	251.72.110.193	251.72.110.254	251.72.110.255	62
5	251.72.111.0/26	251.72.111.0	251.72.111.1	251.72.111.62	251.72.111.63	62
6	251.72.111.64/26	251.72.111.64	251.72.111.65	251.72.111.126	251.72.111.127	62
7	251.72.111.128/26	251.72.111.128	251.72.111.129	251.72.111.190	251.72.111.191	62
8	251.72.111.192/26	251.72.111.192	251.72.111.193	251.72.111.254	251.72.111.255	62

Split 251.72.110.0/23 into 16 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	251.72.110.0/27	251.72.110.0	251.72.110.1	251.72.110.30	251.72.110.31	30
2	251.72.110.32/27	251.72.110.32	251.72.110.33	251.72.110.62	251.72.110.63	30
3	251.72.110.64/27	251.72.110.64	251.72.110.65	251.72.110.94	251.72.110.95	30
4	251.72.110.96/27	251.72.110.96	251.72.110.97	251.72.110.126	251.72.110.127	30
5	251.72.110.128/27	251.72.110.128	251.72.110.129	251.72.110.158	251.72.110.159	30
6	251.72.110.160/27	251.72.110.160	251.72.110.161	251.72.110.190	251.72.110.191	30
7	251.72.110.192/27	251.72.110.192	251.72.110.193	251.72.110.222	251.72.110.223	30
8	251.72.110.224/27	251.72.110.224	251.72.110.225	251.72.110.254	251.72.110.255	30
9	251.72.111.0/27	251.72.111.0	251.72.111.1	251.72.111.30	251.72.111.31	30
10	251.72.111.32/27	251.72.111.32	251.72.111.33	251.72.111.62	251.72.111.63	30
11	251.72.111.64/27	251.72.111.64	251.72.111.65	251.72.111.94	251.72.111.95	30
12	251.72.111.96/27	251.72.111.96	251.72.111.97	251.72.111.126	251.72.111.127	30
13	251.72.111.128/27	251.72.111.128	251.72.111.129	251.72.111.158	251.72.111.159	30
14	251.72.111.160/27	251.72.111.160	251.72.111.161	251.72.111.190	251.72.111.191	30
15	251.72.111.192/27	251.72.111.192	251.72.111.193	251.72.111.222	251.72.111.223	30
16	251.72.111.224/27	251.72.111.224	251.72.111.225	251.72.111.254	251.72.111.255	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 251.72.108.0/22 Sibling /23 block 251.72.108.0/23

Adjacent Prefix Sizes

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