231.4.8.0/23

Multicast RFC 5771

Class D (Multicast) — /23 prefix — 510 usable hosts

Network Address

231.4.8.0

Broadcast Address

231.4.9.255

Subnet Mask

255.255.254.0

Usable Hosts

510

First Usable IP

231.4.8.1

Last Usable IP

231.4.9.254

Total IPs

512

Prefix Length

/23

Network address — the base address of the block (231.4.8.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 231.4.9.255 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	231.4.8.0/23
Network Address	231.4.8.0
Broadcast Address	231.4.9.255
Subnet Mask	255.255.254.0
Wildcard Mask	0.0.1.255
Prefix Length	/23
IP Address Class	Class D (Multicast)
Total IP Addresses	512
Usable Host Addresses	510
First Usable IP	231.4.8.1
Last Usable IP	231.4.9.254
Network (Hex)	0xE7040800
Broadcast (Hex)	0xE70409FF
Governing RFC	RFC 5771
Address Type	Multicast

Binary Representation

Network Address

11100111.00000100 11100111.00000100.00001000.00000000

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 231.4.8.0/23 into 2 equal /24 subnets (254 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	231.4.8.0/24	231.4.8.0	231.4.8.1	231.4.8.254	231.4.8.255	254
2	231.4.9.0/24	231.4.9.0	231.4.9.1	231.4.9.254	231.4.9.255	254

Split 231.4.8.0/23 into 4 equal /25 subnets (126 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	231.4.8.0/25	231.4.8.0	231.4.8.1	231.4.8.126	231.4.8.127	126
2	231.4.8.128/25	231.4.8.128	231.4.8.129	231.4.8.254	231.4.8.255	126
3	231.4.9.0/25	231.4.9.0	231.4.9.1	231.4.9.126	231.4.9.127	126
4	231.4.9.128/25	231.4.9.128	231.4.9.129	231.4.9.254	231.4.9.255	126

Split 231.4.8.0/23 into 8 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	231.4.8.0/26	231.4.8.0	231.4.8.1	231.4.8.62	231.4.8.63	62
2	231.4.8.64/26	231.4.8.64	231.4.8.65	231.4.8.126	231.4.8.127	62
3	231.4.8.128/26	231.4.8.128	231.4.8.129	231.4.8.190	231.4.8.191	62
4	231.4.8.192/26	231.4.8.192	231.4.8.193	231.4.8.254	231.4.8.255	62
5	231.4.9.0/26	231.4.9.0	231.4.9.1	231.4.9.62	231.4.9.63	62
6	231.4.9.64/26	231.4.9.64	231.4.9.65	231.4.9.126	231.4.9.127	62
7	231.4.9.128/26	231.4.9.128	231.4.9.129	231.4.9.190	231.4.9.191	62
8	231.4.9.192/26	231.4.9.192	231.4.9.193	231.4.9.254	231.4.9.255	62

Split 231.4.8.0/23 into 16 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	231.4.8.0/27	231.4.8.0	231.4.8.1	231.4.8.30	231.4.8.31	30
2	231.4.8.32/27	231.4.8.32	231.4.8.33	231.4.8.62	231.4.8.63	30
3	231.4.8.64/27	231.4.8.64	231.4.8.65	231.4.8.94	231.4.8.95	30
4	231.4.8.96/27	231.4.8.96	231.4.8.97	231.4.8.126	231.4.8.127	30
5	231.4.8.128/27	231.4.8.128	231.4.8.129	231.4.8.158	231.4.8.159	30
6	231.4.8.160/27	231.4.8.160	231.4.8.161	231.4.8.190	231.4.8.191	30
7	231.4.8.192/27	231.4.8.192	231.4.8.193	231.4.8.222	231.4.8.223	30
8	231.4.8.224/27	231.4.8.224	231.4.8.225	231.4.8.254	231.4.8.255	30
9	231.4.9.0/27	231.4.9.0	231.4.9.1	231.4.9.30	231.4.9.31	30
10	231.4.9.32/27	231.4.9.32	231.4.9.33	231.4.9.62	231.4.9.63	30
11	231.4.9.64/27	231.4.9.64	231.4.9.65	231.4.9.94	231.4.9.95	30
12	231.4.9.96/27	231.4.9.96	231.4.9.97	231.4.9.126	231.4.9.127	30
13	231.4.9.128/27	231.4.9.128	231.4.9.129	231.4.9.158	231.4.9.159	30
14	231.4.9.160/27	231.4.9.160	231.4.9.161	231.4.9.190	231.4.9.191	30
15	231.4.9.192/27	231.4.9.192	231.4.9.193	231.4.9.222	231.4.9.223	30
16	231.4.9.224/27	231.4.9.224	231.4.9.225	231.4.9.254	231.4.9.255	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 231.4.8.0/22 Sibling /23 block 231.4.10.0/23

Adjacent Prefix Sizes

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