1.78.147.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

1.78.147.0

Broadcast Address

1.78.147.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

1.78.147.1

Last Usable IP

1.78.147.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (1.78.147.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 1.78.147.127 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	1.78.147.0/25
Network Address	1.78.147.0
Broadcast Address	1.78.147.127
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	1.78.147.1
Last Usable IP	1.78.147.126
Network (Hex)	0x014E9300
Broadcast (Hex)	0x014E937F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00000001.01001110.10010011 00000001.01001110.10010011.00000000

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 1.78.147.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.78.147.0/26	1.78.147.0	1.78.147.1	1.78.147.62	1.78.147.63	62
2	1.78.147.64/26	1.78.147.64	1.78.147.65	1.78.147.126	1.78.147.127	62

Split 1.78.147.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.78.147.0/27	1.78.147.0	1.78.147.1	1.78.147.30	1.78.147.31	30
2	1.78.147.32/27	1.78.147.32	1.78.147.33	1.78.147.62	1.78.147.63	30
3	1.78.147.64/27	1.78.147.64	1.78.147.65	1.78.147.94	1.78.147.95	30
4	1.78.147.96/27	1.78.147.96	1.78.147.97	1.78.147.126	1.78.147.127	30

Split 1.78.147.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.78.147.0/28	1.78.147.0	1.78.147.1	1.78.147.14	1.78.147.15	14
2	1.78.147.16/28	1.78.147.16	1.78.147.17	1.78.147.30	1.78.147.31	14
3	1.78.147.32/28	1.78.147.32	1.78.147.33	1.78.147.46	1.78.147.47	14
4	1.78.147.48/28	1.78.147.48	1.78.147.49	1.78.147.62	1.78.147.63	14
5	1.78.147.64/28	1.78.147.64	1.78.147.65	1.78.147.78	1.78.147.79	14
6	1.78.147.80/28	1.78.147.80	1.78.147.81	1.78.147.94	1.78.147.95	14
7	1.78.147.96/28	1.78.147.96	1.78.147.97	1.78.147.110	1.78.147.111	14
8	1.78.147.112/28	1.78.147.112	1.78.147.113	1.78.147.126	1.78.147.127	14

Split 1.78.147.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.78.147.0/29	1.78.147.0	1.78.147.1	1.78.147.6	1.78.147.7	6
2	1.78.147.8/29	1.78.147.8	1.78.147.9	1.78.147.14	1.78.147.15	6
3	1.78.147.16/29	1.78.147.16	1.78.147.17	1.78.147.22	1.78.147.23	6
4	1.78.147.24/29	1.78.147.24	1.78.147.25	1.78.147.30	1.78.147.31	6
5	1.78.147.32/29	1.78.147.32	1.78.147.33	1.78.147.38	1.78.147.39	6
6	1.78.147.40/29	1.78.147.40	1.78.147.41	1.78.147.46	1.78.147.47	6
7	1.78.147.48/29	1.78.147.48	1.78.147.49	1.78.147.54	1.78.147.55	6
8	1.78.147.56/29	1.78.147.56	1.78.147.57	1.78.147.62	1.78.147.63	6
9	1.78.147.64/29	1.78.147.64	1.78.147.65	1.78.147.70	1.78.147.71	6
10	1.78.147.72/29	1.78.147.72	1.78.147.73	1.78.147.78	1.78.147.79	6
11	1.78.147.80/29	1.78.147.80	1.78.147.81	1.78.147.86	1.78.147.87	6
12	1.78.147.88/29	1.78.147.88	1.78.147.89	1.78.147.94	1.78.147.95	6
13	1.78.147.96/29	1.78.147.96	1.78.147.97	1.78.147.102	1.78.147.103	6
14	1.78.147.104/29	1.78.147.104	1.78.147.105	1.78.147.110	1.78.147.111	6
15	1.78.147.112/29	1.78.147.112	1.78.147.113	1.78.147.118	1.78.147.119	6
16	1.78.147.120/29	1.78.147.120	1.78.147.121	1.78.147.126	1.78.147.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

1.78.147.0 net

1.78.147.1

1.78.147.2

1.78.147.3

1.78.147.4

1.78.147.5

1.78.147.6

1.78.147.7

1.78.147.8

1.78.147.9

1.78.147.10

1.78.147.11

1.78.147.12

1.78.147.13

1.78.147.14

1.78.147.15

… 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 1.78.147.0/24 Sibling /25 block 1.78.147.128/25

Adjacent Prefix Sizes

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