100.96.9.128/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

100.96.9.128

Broadcast Address

100.96.9.255

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

100.96.9.129

Last Usable IP

100.96.9.254

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (100.96.9.128). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 100.96.9.255 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	100.96.9.128/25
Network Address	100.96.9.128
Broadcast Address	100.96.9.255
Subnet Mask	255.255.255.128
Wildcard Mask	0.0.0.127
Prefix Length	/25
IP Address Class	Class A
Total IP Addresses	128
Usable Host Addresses	126
First Usable IP	100.96.9.129
Last Usable IP	100.96.9.254
Network (Hex)	0x64600980
Broadcast (Hex)	0x646009FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

01100100.01100000.00001001 01100100.01100000.00001001.10000000

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 100.96.9.128/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.96.9.128/26	100.96.9.128	100.96.9.129	100.96.9.190	100.96.9.191	62
2	100.96.9.192/26	100.96.9.192	100.96.9.193	100.96.9.254	100.96.9.255	62

Split 100.96.9.128/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.96.9.128/27	100.96.9.128	100.96.9.129	100.96.9.158	100.96.9.159	30
2	100.96.9.160/27	100.96.9.160	100.96.9.161	100.96.9.190	100.96.9.191	30
3	100.96.9.192/27	100.96.9.192	100.96.9.193	100.96.9.222	100.96.9.223	30
4	100.96.9.224/27	100.96.9.224	100.96.9.225	100.96.9.254	100.96.9.255	30

Split 100.96.9.128/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.96.9.128/28	100.96.9.128	100.96.9.129	100.96.9.142	100.96.9.143	14
2	100.96.9.144/28	100.96.9.144	100.96.9.145	100.96.9.158	100.96.9.159	14
3	100.96.9.160/28	100.96.9.160	100.96.9.161	100.96.9.174	100.96.9.175	14
4	100.96.9.176/28	100.96.9.176	100.96.9.177	100.96.9.190	100.96.9.191	14
5	100.96.9.192/28	100.96.9.192	100.96.9.193	100.96.9.206	100.96.9.207	14
6	100.96.9.208/28	100.96.9.208	100.96.9.209	100.96.9.222	100.96.9.223	14
7	100.96.9.224/28	100.96.9.224	100.96.9.225	100.96.9.238	100.96.9.239	14
8	100.96.9.240/28	100.96.9.240	100.96.9.241	100.96.9.254	100.96.9.255	14

Split 100.96.9.128/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.96.9.128/29	100.96.9.128	100.96.9.129	100.96.9.134	100.96.9.135	6
2	100.96.9.136/29	100.96.9.136	100.96.9.137	100.96.9.142	100.96.9.143	6
3	100.96.9.144/29	100.96.9.144	100.96.9.145	100.96.9.150	100.96.9.151	6
4	100.96.9.152/29	100.96.9.152	100.96.9.153	100.96.9.158	100.96.9.159	6
5	100.96.9.160/29	100.96.9.160	100.96.9.161	100.96.9.166	100.96.9.167	6
6	100.96.9.168/29	100.96.9.168	100.96.9.169	100.96.9.174	100.96.9.175	6
7	100.96.9.176/29	100.96.9.176	100.96.9.177	100.96.9.182	100.96.9.183	6
8	100.96.9.184/29	100.96.9.184	100.96.9.185	100.96.9.190	100.96.9.191	6
9	100.96.9.192/29	100.96.9.192	100.96.9.193	100.96.9.198	100.96.9.199	6
10	100.96.9.200/29	100.96.9.200	100.96.9.201	100.96.9.206	100.96.9.207	6
11	100.96.9.208/29	100.96.9.208	100.96.9.209	100.96.9.214	100.96.9.215	6
12	100.96.9.216/29	100.96.9.216	100.96.9.217	100.96.9.222	100.96.9.223	6
13	100.96.9.224/29	100.96.9.224	100.96.9.225	100.96.9.230	100.96.9.231	6
14	100.96.9.232/29	100.96.9.232	100.96.9.233	100.96.9.238	100.96.9.239	6
15	100.96.9.240/29	100.96.9.240	100.96.9.241	100.96.9.246	100.96.9.247	6
16	100.96.9.248/29	100.96.9.248	100.96.9.249	100.96.9.254	100.96.9.255	6

IP Address Sample

Showing first 16 of 128 total IPs.

100.96.9.128 net

100.96.9.129

100.96.9.130

100.96.9.131

100.96.9.132

100.96.9.133

100.96.9.134

100.96.9.135

100.96.9.136

100.96.9.137

100.96.9.138

100.96.9.139

100.96.9.140

100.96.9.141

100.96.9.142

100.96.9.143

… 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 100.96.9.0/24 Sibling /25 block 100.96.9.0/25

Adjacent Prefix Sizes

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