38.2.5.128/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

38.2.5.128

Broadcast Address

38.2.5.255

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

38.2.5.129

Last Usable IP

38.2.5.254

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (38.2.5.128). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 38.2.5.255 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	38.2.5.128/25
Network Address	38.2.5.128
Broadcast Address	38.2.5.255
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	38.2.5.129
Last Usable IP	38.2.5.254
Network (Hex)	0x26020580
Broadcast (Hex)	0x260205FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

00100110.00000010.00000101 00100110.00000010.00000101.10000000

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 38.2.5.128/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	38.2.5.128/26	38.2.5.128	38.2.5.129	38.2.5.190	38.2.5.191	62
2	38.2.5.192/26	38.2.5.192	38.2.5.193	38.2.5.254	38.2.5.255	62

Split 38.2.5.128/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	38.2.5.128/27	38.2.5.128	38.2.5.129	38.2.5.158	38.2.5.159	30
2	38.2.5.160/27	38.2.5.160	38.2.5.161	38.2.5.190	38.2.5.191	30
3	38.2.5.192/27	38.2.5.192	38.2.5.193	38.2.5.222	38.2.5.223	30
4	38.2.5.224/27	38.2.5.224	38.2.5.225	38.2.5.254	38.2.5.255	30

Split 38.2.5.128/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	38.2.5.128/28	38.2.5.128	38.2.5.129	38.2.5.142	38.2.5.143	14
2	38.2.5.144/28	38.2.5.144	38.2.5.145	38.2.5.158	38.2.5.159	14
3	38.2.5.160/28	38.2.5.160	38.2.5.161	38.2.5.174	38.2.5.175	14
4	38.2.5.176/28	38.2.5.176	38.2.5.177	38.2.5.190	38.2.5.191	14
5	38.2.5.192/28	38.2.5.192	38.2.5.193	38.2.5.206	38.2.5.207	14
6	38.2.5.208/28	38.2.5.208	38.2.5.209	38.2.5.222	38.2.5.223	14
7	38.2.5.224/28	38.2.5.224	38.2.5.225	38.2.5.238	38.2.5.239	14
8	38.2.5.240/28	38.2.5.240	38.2.5.241	38.2.5.254	38.2.5.255	14

Split 38.2.5.128/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	38.2.5.128/29	38.2.5.128	38.2.5.129	38.2.5.134	38.2.5.135	6
2	38.2.5.136/29	38.2.5.136	38.2.5.137	38.2.5.142	38.2.5.143	6
3	38.2.5.144/29	38.2.5.144	38.2.5.145	38.2.5.150	38.2.5.151	6
4	38.2.5.152/29	38.2.5.152	38.2.5.153	38.2.5.158	38.2.5.159	6
5	38.2.5.160/29	38.2.5.160	38.2.5.161	38.2.5.166	38.2.5.167	6
6	38.2.5.168/29	38.2.5.168	38.2.5.169	38.2.5.174	38.2.5.175	6
7	38.2.5.176/29	38.2.5.176	38.2.5.177	38.2.5.182	38.2.5.183	6
8	38.2.5.184/29	38.2.5.184	38.2.5.185	38.2.5.190	38.2.5.191	6
9	38.2.5.192/29	38.2.5.192	38.2.5.193	38.2.5.198	38.2.5.199	6
10	38.2.5.200/29	38.2.5.200	38.2.5.201	38.2.5.206	38.2.5.207	6
11	38.2.5.208/29	38.2.5.208	38.2.5.209	38.2.5.214	38.2.5.215	6
12	38.2.5.216/29	38.2.5.216	38.2.5.217	38.2.5.222	38.2.5.223	6
13	38.2.5.224/29	38.2.5.224	38.2.5.225	38.2.5.230	38.2.5.231	6
14	38.2.5.232/29	38.2.5.232	38.2.5.233	38.2.5.238	38.2.5.239	6
15	38.2.5.240/29	38.2.5.240	38.2.5.241	38.2.5.246	38.2.5.247	6
16	38.2.5.248/29	38.2.5.248	38.2.5.249	38.2.5.254	38.2.5.255	6

IP Address Sample

Showing first 16 of 128 total IPs.

38.2.5.128 net

38.2.5.129

38.2.5.130

38.2.5.131

38.2.5.132

38.2.5.133

38.2.5.134

38.2.5.135

38.2.5.136

38.2.5.137

38.2.5.138

38.2.5.139

38.2.5.140

38.2.5.141

38.2.5.142

38.2.5.143

… 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 38.2.5.0/24 Sibling /25 block 38.2.5.0/25

Adjacent Prefix Sizes

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