10.11.78.0/25

Private (RFC 1918) RFC 1918

Class A — /25 prefix — 126 usable hosts

Network Address

10.11.78.0

Broadcast Address

10.11.78.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

10.11.78.1

Last Usable IP

10.11.78.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (10.11.78.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 10.11.78.127 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	10.11.78.0/25
Network Address	10.11.78.0
Broadcast Address	10.11.78.127
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	10.11.78.1
Last Usable IP	10.11.78.126
Network (Hex)	0x0A0B4E00
Broadcast (Hex)	0x0A0B4E7F
Governing RFC	RFC 1918
Address Type	Private (RFC 1918)

Binary Representation

Network Address

00001010.00001011.01001110 00001010.00001011.01001110.00000000

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 10.11.78.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.11.78.0/26	10.11.78.0	10.11.78.1	10.11.78.62	10.11.78.63	62
2	10.11.78.64/26	10.11.78.64	10.11.78.65	10.11.78.126	10.11.78.127	62

Split 10.11.78.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.11.78.0/27	10.11.78.0	10.11.78.1	10.11.78.30	10.11.78.31	30
2	10.11.78.32/27	10.11.78.32	10.11.78.33	10.11.78.62	10.11.78.63	30
3	10.11.78.64/27	10.11.78.64	10.11.78.65	10.11.78.94	10.11.78.95	30
4	10.11.78.96/27	10.11.78.96	10.11.78.97	10.11.78.126	10.11.78.127	30

Split 10.11.78.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.11.78.0/28	10.11.78.0	10.11.78.1	10.11.78.14	10.11.78.15	14
2	10.11.78.16/28	10.11.78.16	10.11.78.17	10.11.78.30	10.11.78.31	14
3	10.11.78.32/28	10.11.78.32	10.11.78.33	10.11.78.46	10.11.78.47	14
4	10.11.78.48/28	10.11.78.48	10.11.78.49	10.11.78.62	10.11.78.63	14
5	10.11.78.64/28	10.11.78.64	10.11.78.65	10.11.78.78	10.11.78.79	14
6	10.11.78.80/28	10.11.78.80	10.11.78.81	10.11.78.94	10.11.78.95	14
7	10.11.78.96/28	10.11.78.96	10.11.78.97	10.11.78.110	10.11.78.111	14
8	10.11.78.112/28	10.11.78.112	10.11.78.113	10.11.78.126	10.11.78.127	14

Split 10.11.78.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	10.11.78.0/29	10.11.78.0	10.11.78.1	10.11.78.6	10.11.78.7	6
2	10.11.78.8/29	10.11.78.8	10.11.78.9	10.11.78.14	10.11.78.15	6
3	10.11.78.16/29	10.11.78.16	10.11.78.17	10.11.78.22	10.11.78.23	6
4	10.11.78.24/29	10.11.78.24	10.11.78.25	10.11.78.30	10.11.78.31	6
5	10.11.78.32/29	10.11.78.32	10.11.78.33	10.11.78.38	10.11.78.39	6
6	10.11.78.40/29	10.11.78.40	10.11.78.41	10.11.78.46	10.11.78.47	6
7	10.11.78.48/29	10.11.78.48	10.11.78.49	10.11.78.54	10.11.78.55	6
8	10.11.78.56/29	10.11.78.56	10.11.78.57	10.11.78.62	10.11.78.63	6
9	10.11.78.64/29	10.11.78.64	10.11.78.65	10.11.78.70	10.11.78.71	6
10	10.11.78.72/29	10.11.78.72	10.11.78.73	10.11.78.78	10.11.78.79	6
11	10.11.78.80/29	10.11.78.80	10.11.78.81	10.11.78.86	10.11.78.87	6
12	10.11.78.88/29	10.11.78.88	10.11.78.89	10.11.78.94	10.11.78.95	6
13	10.11.78.96/29	10.11.78.96	10.11.78.97	10.11.78.102	10.11.78.103	6
14	10.11.78.104/29	10.11.78.104	10.11.78.105	10.11.78.110	10.11.78.111	6
15	10.11.78.112/29	10.11.78.112	10.11.78.113	10.11.78.118	10.11.78.119	6
16	10.11.78.120/29	10.11.78.120	10.11.78.121	10.11.78.126	10.11.78.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

10.11.78.0 net

10.11.78.1

10.11.78.2

10.11.78.3

10.11.78.4

10.11.78.5

10.11.78.6

10.11.78.7

10.11.78.8

10.11.78.9

10.11.78.10

10.11.78.11

10.11.78.12

10.11.78.13

10.11.78.14

10.11.78.15

… 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 10.11.78.0/24 Sibling /25 block 10.11.78.128/25

Adjacent Prefix Sizes

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