183.2.5.128/25

Public

Class B — /25 prefix — 126 usable hosts

Network Address

183.2.5.128

Broadcast Address

183.2.5.255

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

183.2.5.129

Last Usable IP

183.2.5.254

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (183.2.5.128). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 183.2.5.255 are delivered to every device in the subnet. Also reserved — not assignable.

Usable hosts — the 126 addresses between those two that you can assign to servers, VMs, or interfaces.

Subnet mask — 255.255.255.128 is the dotted-decimal equivalent of /25. Older tools and Cisco configs use this format instead of CIDR slash notation.

Full Details

CIDR Notation	183.2.5.128/25
Network Address	183.2.5.128
Broadcast Address	183.2.5.255
Subnet Mask	255.255.255.128
Wildcard Mask	0.0.0.127
Prefix Length	/25
IP Address Class	Class B
Total IP Addresses	128
Usable Host Addresses	126
First Usable IP	183.2.5.129
Last Usable IP	183.2.5.254
Network (Hex)	0xB7020580
Broadcast (Hex)	0xB70205FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

10110111.00000010.00000101 10110111.00000010.00000101.10000000

Subnet Mask

11111111.11111111.11111111.10000000

The first 25 bits (1s in the mask) identify the network. The remaining 7 bits identify hosts within the network.

Split into Equal Subnets

Split 183.2.5.128/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	183.2.5.128/26	183.2.5.128	183.2.5.129	183.2.5.190	183.2.5.191	62
2	183.2.5.192/26	183.2.5.192	183.2.5.193	183.2.5.254	183.2.5.255	62

Split 183.2.5.128/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	183.2.5.128/27	183.2.5.128	183.2.5.129	183.2.5.158	183.2.5.159	30
2	183.2.5.160/27	183.2.5.160	183.2.5.161	183.2.5.190	183.2.5.191	30
3	183.2.5.192/27	183.2.5.192	183.2.5.193	183.2.5.222	183.2.5.223	30
4	183.2.5.224/27	183.2.5.224	183.2.5.225	183.2.5.254	183.2.5.255	30

Split 183.2.5.128/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	183.2.5.128/28	183.2.5.128	183.2.5.129	183.2.5.142	183.2.5.143	14
2	183.2.5.144/28	183.2.5.144	183.2.5.145	183.2.5.158	183.2.5.159	14
3	183.2.5.160/28	183.2.5.160	183.2.5.161	183.2.5.174	183.2.5.175	14
4	183.2.5.176/28	183.2.5.176	183.2.5.177	183.2.5.190	183.2.5.191	14
5	183.2.5.192/28	183.2.5.192	183.2.5.193	183.2.5.206	183.2.5.207	14
6	183.2.5.208/28	183.2.5.208	183.2.5.209	183.2.5.222	183.2.5.223	14
7	183.2.5.224/28	183.2.5.224	183.2.5.225	183.2.5.238	183.2.5.239	14
8	183.2.5.240/28	183.2.5.240	183.2.5.241	183.2.5.254	183.2.5.255	14

Split 183.2.5.128/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	183.2.5.128/29	183.2.5.128	183.2.5.129	183.2.5.134	183.2.5.135	6
2	183.2.5.136/29	183.2.5.136	183.2.5.137	183.2.5.142	183.2.5.143	6
3	183.2.5.144/29	183.2.5.144	183.2.5.145	183.2.5.150	183.2.5.151	6
4	183.2.5.152/29	183.2.5.152	183.2.5.153	183.2.5.158	183.2.5.159	6
5	183.2.5.160/29	183.2.5.160	183.2.5.161	183.2.5.166	183.2.5.167	6
6	183.2.5.168/29	183.2.5.168	183.2.5.169	183.2.5.174	183.2.5.175	6
7	183.2.5.176/29	183.2.5.176	183.2.5.177	183.2.5.182	183.2.5.183	6
8	183.2.5.184/29	183.2.5.184	183.2.5.185	183.2.5.190	183.2.5.191	6
9	183.2.5.192/29	183.2.5.192	183.2.5.193	183.2.5.198	183.2.5.199	6
10	183.2.5.200/29	183.2.5.200	183.2.5.201	183.2.5.206	183.2.5.207	6
11	183.2.5.208/29	183.2.5.208	183.2.5.209	183.2.5.214	183.2.5.215	6
12	183.2.5.216/29	183.2.5.216	183.2.5.217	183.2.5.222	183.2.5.223	6
13	183.2.5.224/29	183.2.5.224	183.2.5.225	183.2.5.230	183.2.5.231	6
14	183.2.5.232/29	183.2.5.232	183.2.5.233	183.2.5.238	183.2.5.239	6
15	183.2.5.240/29	183.2.5.240	183.2.5.241	183.2.5.246	183.2.5.247	6
16	183.2.5.248/29	183.2.5.248	183.2.5.249	183.2.5.254	183.2.5.255	6

IP Address Sample

Showing first 16 of 128 total IPs.

183.2.5.128 net

183.2.5.129

183.2.5.130

183.2.5.131

183.2.5.132

183.2.5.133

183.2.5.134

183.2.5.135

183.2.5.136

183.2.5.137

183.2.5.138

183.2.5.139

183.2.5.140

183.2.5.141

183.2.5.142

183.2.5.143

… 112 more IPs …

/25 Subnet Reference

Total IPs 128

Usable Hosts 126

Subnet Mask 255.255.255.128

Wildcard 0.0.0.127

Full /25 reference →

Related Ranges

Parent /24 block 183.2.5.0/24 Sibling /25 block 183.2.5.0/25

Adjacent Prefix Sizes

/23 510 hosts /24 254 hosts /25 126 hosts /26 62 hosts /27 30 hosts