27.0.2.128/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

27.0.2.128

Broadcast Address

27.0.2.255

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

27.0.2.129

Last Usable IP

27.0.2.254

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (27.0.2.128). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 27.0.2.255 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	27.0.2.128/25
Network Address	27.0.2.128
Broadcast Address	27.0.2.255
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	27.0.2.129
Last Usable IP	27.0.2.254
Network (Hex)	0x1B000280
Broadcast (Hex)	0x1B0002FF
Address Type	Public / Globally Routable

Binary Representation

Network Address

00011011.00000000.00000010 00011011.00000000.00000010.10000000

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 27.0.2.128/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	27.0.2.128/26	27.0.2.128	27.0.2.129	27.0.2.190	27.0.2.191	62
2	27.0.2.192/26	27.0.2.192	27.0.2.193	27.0.2.254	27.0.2.255	62

Split 27.0.2.128/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	27.0.2.128/27	27.0.2.128	27.0.2.129	27.0.2.158	27.0.2.159	30
2	27.0.2.160/27	27.0.2.160	27.0.2.161	27.0.2.190	27.0.2.191	30
3	27.0.2.192/27	27.0.2.192	27.0.2.193	27.0.2.222	27.0.2.223	30
4	27.0.2.224/27	27.0.2.224	27.0.2.225	27.0.2.254	27.0.2.255	30

Split 27.0.2.128/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	27.0.2.128/28	27.0.2.128	27.0.2.129	27.0.2.142	27.0.2.143	14
2	27.0.2.144/28	27.0.2.144	27.0.2.145	27.0.2.158	27.0.2.159	14
3	27.0.2.160/28	27.0.2.160	27.0.2.161	27.0.2.174	27.0.2.175	14
4	27.0.2.176/28	27.0.2.176	27.0.2.177	27.0.2.190	27.0.2.191	14
5	27.0.2.192/28	27.0.2.192	27.0.2.193	27.0.2.206	27.0.2.207	14
6	27.0.2.208/28	27.0.2.208	27.0.2.209	27.0.2.222	27.0.2.223	14
7	27.0.2.224/28	27.0.2.224	27.0.2.225	27.0.2.238	27.0.2.239	14
8	27.0.2.240/28	27.0.2.240	27.0.2.241	27.0.2.254	27.0.2.255	14

Split 27.0.2.128/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	27.0.2.128/29	27.0.2.128	27.0.2.129	27.0.2.134	27.0.2.135	6
2	27.0.2.136/29	27.0.2.136	27.0.2.137	27.0.2.142	27.0.2.143	6
3	27.0.2.144/29	27.0.2.144	27.0.2.145	27.0.2.150	27.0.2.151	6
4	27.0.2.152/29	27.0.2.152	27.0.2.153	27.0.2.158	27.0.2.159	6
5	27.0.2.160/29	27.0.2.160	27.0.2.161	27.0.2.166	27.0.2.167	6
6	27.0.2.168/29	27.0.2.168	27.0.2.169	27.0.2.174	27.0.2.175	6
7	27.0.2.176/29	27.0.2.176	27.0.2.177	27.0.2.182	27.0.2.183	6
8	27.0.2.184/29	27.0.2.184	27.0.2.185	27.0.2.190	27.0.2.191	6
9	27.0.2.192/29	27.0.2.192	27.0.2.193	27.0.2.198	27.0.2.199	6
10	27.0.2.200/29	27.0.2.200	27.0.2.201	27.0.2.206	27.0.2.207	6
11	27.0.2.208/29	27.0.2.208	27.0.2.209	27.0.2.214	27.0.2.215	6
12	27.0.2.216/29	27.0.2.216	27.0.2.217	27.0.2.222	27.0.2.223	6
13	27.0.2.224/29	27.0.2.224	27.0.2.225	27.0.2.230	27.0.2.231	6
14	27.0.2.232/29	27.0.2.232	27.0.2.233	27.0.2.238	27.0.2.239	6
15	27.0.2.240/29	27.0.2.240	27.0.2.241	27.0.2.246	27.0.2.247	6
16	27.0.2.248/29	27.0.2.248	27.0.2.249	27.0.2.254	27.0.2.255	6

IP Address Sample

Showing first 16 of 128 total IPs.

27.0.2.128 net

27.0.2.129

27.0.2.130

27.0.2.131

27.0.2.132

27.0.2.133

27.0.2.134

27.0.2.135

27.0.2.136

27.0.2.137

27.0.2.138

27.0.2.139

27.0.2.140

27.0.2.141

27.0.2.142

27.0.2.143

… 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 27.0.2.0/24 Sibling /25 block 27.0.2.0/25

Adjacent Prefix Sizes

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