39.2.72.0/23

Public

Class A — /23 prefix — 510 usable hosts

Network Address

39.2.72.0

Broadcast Address

39.2.73.255

Subnet Mask

255.255.254.0

Usable Hosts

510

First Usable IP

39.2.72.1

Last Usable IP

39.2.73.254

Total IPs

512

Prefix Length

/23

Network address — the base address of the block (39.2.72.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 39.2.73.255 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	39.2.72.0/23
Network Address	39.2.72.0
Broadcast Address	39.2.73.255
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	39.2.72.1
Last Usable IP	39.2.73.254
Network (Hex)	0x27024800
Broadcast (Hex)	0x270249FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

00100111.00000010 00100111.00000010.01001000.00000000

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 39.2.72.0/23 into 2 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	39.2.72.0/24	39.2.72.0	39.2.72.1	39.2.72.254	39.2.72.255	254
2	39.2.73.0/24	39.2.73.0	39.2.73.1	39.2.73.254	39.2.73.255	254

Split 39.2.72.0/23 into 4 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	39.2.72.0/25	39.2.72.0	39.2.72.1	39.2.72.126	39.2.72.127	126
2	39.2.72.128/25	39.2.72.128	39.2.72.129	39.2.72.254	39.2.72.255	126
3	39.2.73.0/25	39.2.73.0	39.2.73.1	39.2.73.126	39.2.73.127	126
4	39.2.73.128/25	39.2.73.128	39.2.73.129	39.2.73.254	39.2.73.255	126

Split 39.2.72.0/23 into 8 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	39.2.72.0/26	39.2.72.0	39.2.72.1	39.2.72.62	39.2.72.63	62
2	39.2.72.64/26	39.2.72.64	39.2.72.65	39.2.72.126	39.2.72.127	62
3	39.2.72.128/26	39.2.72.128	39.2.72.129	39.2.72.190	39.2.72.191	62
4	39.2.72.192/26	39.2.72.192	39.2.72.193	39.2.72.254	39.2.72.255	62
5	39.2.73.0/26	39.2.73.0	39.2.73.1	39.2.73.62	39.2.73.63	62
6	39.2.73.64/26	39.2.73.64	39.2.73.65	39.2.73.126	39.2.73.127	62
7	39.2.73.128/26	39.2.73.128	39.2.73.129	39.2.73.190	39.2.73.191	62
8	39.2.73.192/26	39.2.73.192	39.2.73.193	39.2.73.254	39.2.73.255	62

Split 39.2.72.0/23 into 16 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	39.2.72.0/27	39.2.72.0	39.2.72.1	39.2.72.30	39.2.72.31	30
2	39.2.72.32/27	39.2.72.32	39.2.72.33	39.2.72.62	39.2.72.63	30
3	39.2.72.64/27	39.2.72.64	39.2.72.65	39.2.72.94	39.2.72.95	30
4	39.2.72.96/27	39.2.72.96	39.2.72.97	39.2.72.126	39.2.72.127	30
5	39.2.72.128/27	39.2.72.128	39.2.72.129	39.2.72.158	39.2.72.159	30
6	39.2.72.160/27	39.2.72.160	39.2.72.161	39.2.72.190	39.2.72.191	30
7	39.2.72.192/27	39.2.72.192	39.2.72.193	39.2.72.222	39.2.72.223	30
8	39.2.72.224/27	39.2.72.224	39.2.72.225	39.2.72.254	39.2.72.255	30
9	39.2.73.0/27	39.2.73.0	39.2.73.1	39.2.73.30	39.2.73.31	30
10	39.2.73.32/27	39.2.73.32	39.2.73.33	39.2.73.62	39.2.73.63	30
11	39.2.73.64/27	39.2.73.64	39.2.73.65	39.2.73.94	39.2.73.95	30
12	39.2.73.96/27	39.2.73.96	39.2.73.97	39.2.73.126	39.2.73.127	30
13	39.2.73.128/27	39.2.73.128	39.2.73.129	39.2.73.158	39.2.73.159	30
14	39.2.73.160/27	39.2.73.160	39.2.73.161	39.2.73.190	39.2.73.191	30
15	39.2.73.192/27	39.2.73.192	39.2.73.193	39.2.73.222	39.2.73.223	30
16	39.2.73.224/27	39.2.73.224	39.2.73.225	39.2.73.254	39.2.73.255	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 39.2.72.0/22 Sibling /23 block 39.2.74.0/23

Adjacent Prefix Sizes

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