151.2.101.0/25

Public

Class B — /25 prefix — 126 usable hosts

Network Address

151.2.101.0

Broadcast Address

151.2.101.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

151.2.101.1

Last Usable IP

151.2.101.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (151.2.101.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 151.2.101.127 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	151.2.101.0/25
Network Address	151.2.101.0
Broadcast Address	151.2.101.127
Subnet Mask	255.255.255.128
Wildcard Mask	0.0.0.127
Prefix Length	/25
IP Address Class	Class B
Total IP Addresses	128
Usable Host Addresses	126
First Usable IP	151.2.101.1
Last Usable IP	151.2.101.126
Network (Hex)	0x97026500
Broadcast (Hex)	0x9702657F
Address Type	Public / Globally Routable

Binary Representation

Network Address

10010111.00000010.01100101 10010111.00000010.01100101.00000000

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 151.2.101.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.101.0/26	151.2.101.0	151.2.101.1	151.2.101.62	151.2.101.63	62
2	151.2.101.64/26	151.2.101.64	151.2.101.65	151.2.101.126	151.2.101.127	62

Split 151.2.101.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.101.0/27	151.2.101.0	151.2.101.1	151.2.101.30	151.2.101.31	30
2	151.2.101.32/27	151.2.101.32	151.2.101.33	151.2.101.62	151.2.101.63	30
3	151.2.101.64/27	151.2.101.64	151.2.101.65	151.2.101.94	151.2.101.95	30
4	151.2.101.96/27	151.2.101.96	151.2.101.97	151.2.101.126	151.2.101.127	30

Split 151.2.101.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.101.0/28	151.2.101.0	151.2.101.1	151.2.101.14	151.2.101.15	14
2	151.2.101.16/28	151.2.101.16	151.2.101.17	151.2.101.30	151.2.101.31	14
3	151.2.101.32/28	151.2.101.32	151.2.101.33	151.2.101.46	151.2.101.47	14
4	151.2.101.48/28	151.2.101.48	151.2.101.49	151.2.101.62	151.2.101.63	14
5	151.2.101.64/28	151.2.101.64	151.2.101.65	151.2.101.78	151.2.101.79	14
6	151.2.101.80/28	151.2.101.80	151.2.101.81	151.2.101.94	151.2.101.95	14
7	151.2.101.96/28	151.2.101.96	151.2.101.97	151.2.101.110	151.2.101.111	14
8	151.2.101.112/28	151.2.101.112	151.2.101.113	151.2.101.126	151.2.101.127	14

Split 151.2.101.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	151.2.101.0/29	151.2.101.0	151.2.101.1	151.2.101.6	151.2.101.7	6
2	151.2.101.8/29	151.2.101.8	151.2.101.9	151.2.101.14	151.2.101.15	6
3	151.2.101.16/29	151.2.101.16	151.2.101.17	151.2.101.22	151.2.101.23	6
4	151.2.101.24/29	151.2.101.24	151.2.101.25	151.2.101.30	151.2.101.31	6
5	151.2.101.32/29	151.2.101.32	151.2.101.33	151.2.101.38	151.2.101.39	6
6	151.2.101.40/29	151.2.101.40	151.2.101.41	151.2.101.46	151.2.101.47	6
7	151.2.101.48/29	151.2.101.48	151.2.101.49	151.2.101.54	151.2.101.55	6
8	151.2.101.56/29	151.2.101.56	151.2.101.57	151.2.101.62	151.2.101.63	6
9	151.2.101.64/29	151.2.101.64	151.2.101.65	151.2.101.70	151.2.101.71	6
10	151.2.101.72/29	151.2.101.72	151.2.101.73	151.2.101.78	151.2.101.79	6
11	151.2.101.80/29	151.2.101.80	151.2.101.81	151.2.101.86	151.2.101.87	6
12	151.2.101.88/29	151.2.101.88	151.2.101.89	151.2.101.94	151.2.101.95	6
13	151.2.101.96/29	151.2.101.96	151.2.101.97	151.2.101.102	151.2.101.103	6
14	151.2.101.104/29	151.2.101.104	151.2.101.105	151.2.101.110	151.2.101.111	6
15	151.2.101.112/29	151.2.101.112	151.2.101.113	151.2.101.118	151.2.101.119	6
16	151.2.101.120/29	151.2.101.120	151.2.101.121	151.2.101.126	151.2.101.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

151.2.101.0 net

151.2.101.1

151.2.101.2

151.2.101.3

151.2.101.4

151.2.101.5

151.2.101.6

151.2.101.7

151.2.101.8

151.2.101.9

151.2.101.10

151.2.101.11

151.2.101.12

151.2.101.13

151.2.101.14

151.2.101.15

… 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 151.2.101.0/24 Sibling /25 block 151.2.101.128/25

Adjacent Prefix Sizes

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