102.159.40.0/23

Public

Class A — /23 prefix — 510 usable hosts

Network Address

102.159.40.0

Broadcast Address

102.159.41.255

Subnet Mask

255.255.254.0

Usable Hosts

510

First Usable IP

102.159.40.1

Last Usable IP

102.159.41.254

Total IPs

512

Prefix Length

/23

Network address — the base address of the block (102.159.40.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 102.159.41.255 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	102.159.40.0/23
Network Address	102.159.40.0
Broadcast Address	102.159.41.255
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	102.159.40.1
Last Usable IP	102.159.41.254
Network (Hex)	0x669F2800
Broadcast (Hex)	0x669F29FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

01100110.10011111 01100110.10011111.00101000.00000000

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 102.159.40.0/23 into 2 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	102.159.40.0/24	102.159.40.0	102.159.40.1	102.159.40.254	102.159.40.255	254
2	102.159.41.0/24	102.159.41.0	102.159.41.1	102.159.41.254	102.159.41.255	254

Split 102.159.40.0/23 into 4 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	102.159.40.0/25	102.159.40.0	102.159.40.1	102.159.40.126	102.159.40.127	126
2	102.159.40.128/25	102.159.40.128	102.159.40.129	102.159.40.254	102.159.40.255	126
3	102.159.41.0/25	102.159.41.0	102.159.41.1	102.159.41.126	102.159.41.127	126
4	102.159.41.128/25	102.159.41.128	102.159.41.129	102.159.41.254	102.159.41.255	126

Split 102.159.40.0/23 into 8 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	102.159.40.0/26	102.159.40.0	102.159.40.1	102.159.40.62	102.159.40.63	62
2	102.159.40.64/26	102.159.40.64	102.159.40.65	102.159.40.126	102.159.40.127	62
3	102.159.40.128/26	102.159.40.128	102.159.40.129	102.159.40.190	102.159.40.191	62
4	102.159.40.192/26	102.159.40.192	102.159.40.193	102.159.40.254	102.159.40.255	62
5	102.159.41.0/26	102.159.41.0	102.159.41.1	102.159.41.62	102.159.41.63	62
6	102.159.41.64/26	102.159.41.64	102.159.41.65	102.159.41.126	102.159.41.127	62
7	102.159.41.128/26	102.159.41.128	102.159.41.129	102.159.41.190	102.159.41.191	62
8	102.159.41.192/26	102.159.41.192	102.159.41.193	102.159.41.254	102.159.41.255	62

Split 102.159.40.0/23 into 16 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	102.159.40.0/27	102.159.40.0	102.159.40.1	102.159.40.30	102.159.40.31	30
2	102.159.40.32/27	102.159.40.32	102.159.40.33	102.159.40.62	102.159.40.63	30
3	102.159.40.64/27	102.159.40.64	102.159.40.65	102.159.40.94	102.159.40.95	30
4	102.159.40.96/27	102.159.40.96	102.159.40.97	102.159.40.126	102.159.40.127	30
5	102.159.40.128/27	102.159.40.128	102.159.40.129	102.159.40.158	102.159.40.159	30
6	102.159.40.160/27	102.159.40.160	102.159.40.161	102.159.40.190	102.159.40.191	30
7	102.159.40.192/27	102.159.40.192	102.159.40.193	102.159.40.222	102.159.40.223	30
8	102.159.40.224/27	102.159.40.224	102.159.40.225	102.159.40.254	102.159.40.255	30
9	102.159.41.0/27	102.159.41.0	102.159.41.1	102.159.41.30	102.159.41.31	30
10	102.159.41.32/27	102.159.41.32	102.159.41.33	102.159.41.62	102.159.41.63	30
11	102.159.41.64/27	102.159.41.64	102.159.41.65	102.159.41.94	102.159.41.95	30
12	102.159.41.96/27	102.159.41.96	102.159.41.97	102.159.41.126	102.159.41.127	30
13	102.159.41.128/27	102.159.41.128	102.159.41.129	102.159.41.158	102.159.41.159	30
14	102.159.41.160/27	102.159.41.160	102.159.41.161	102.159.41.190	102.159.41.191	30
15	102.159.41.192/27	102.159.41.192	102.159.41.193	102.159.41.222	102.159.41.223	30
16	102.159.41.224/27	102.159.41.224	102.159.41.225	102.159.41.254	102.159.41.255	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 102.159.40.0/22 Sibling /23 block 102.159.42.0/23

Adjacent Prefix Sizes

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