100.86.133.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

100.86.133.0

Broadcast Address

100.86.133.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

100.86.133.1

Last Usable IP

100.86.133.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (100.86.133.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 100.86.133.127 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	100.86.133.0/25
Network Address	100.86.133.0
Broadcast Address	100.86.133.127
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	100.86.133.1
Last Usable IP	100.86.133.126
Network (Hex)	0x64568500
Broadcast (Hex)	0x6456857F
Address Type	Public / Globally Routable

Binary Representation

Network Address

01100100.01010110.10000101 01100100.01010110.10000101.00000000

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 100.86.133.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.86.133.0/26	100.86.133.0	100.86.133.1	100.86.133.62	100.86.133.63	62
2	100.86.133.64/26	100.86.133.64	100.86.133.65	100.86.133.126	100.86.133.127	62

Split 100.86.133.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.86.133.0/27	100.86.133.0	100.86.133.1	100.86.133.30	100.86.133.31	30
2	100.86.133.32/27	100.86.133.32	100.86.133.33	100.86.133.62	100.86.133.63	30
3	100.86.133.64/27	100.86.133.64	100.86.133.65	100.86.133.94	100.86.133.95	30
4	100.86.133.96/27	100.86.133.96	100.86.133.97	100.86.133.126	100.86.133.127	30

Split 100.86.133.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.86.133.0/28	100.86.133.0	100.86.133.1	100.86.133.14	100.86.133.15	14
2	100.86.133.16/28	100.86.133.16	100.86.133.17	100.86.133.30	100.86.133.31	14
3	100.86.133.32/28	100.86.133.32	100.86.133.33	100.86.133.46	100.86.133.47	14
4	100.86.133.48/28	100.86.133.48	100.86.133.49	100.86.133.62	100.86.133.63	14
5	100.86.133.64/28	100.86.133.64	100.86.133.65	100.86.133.78	100.86.133.79	14
6	100.86.133.80/28	100.86.133.80	100.86.133.81	100.86.133.94	100.86.133.95	14
7	100.86.133.96/28	100.86.133.96	100.86.133.97	100.86.133.110	100.86.133.111	14
8	100.86.133.112/28	100.86.133.112	100.86.133.113	100.86.133.126	100.86.133.127	14

Split 100.86.133.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	100.86.133.0/29	100.86.133.0	100.86.133.1	100.86.133.6	100.86.133.7	6
2	100.86.133.8/29	100.86.133.8	100.86.133.9	100.86.133.14	100.86.133.15	6
3	100.86.133.16/29	100.86.133.16	100.86.133.17	100.86.133.22	100.86.133.23	6
4	100.86.133.24/29	100.86.133.24	100.86.133.25	100.86.133.30	100.86.133.31	6
5	100.86.133.32/29	100.86.133.32	100.86.133.33	100.86.133.38	100.86.133.39	6
6	100.86.133.40/29	100.86.133.40	100.86.133.41	100.86.133.46	100.86.133.47	6
7	100.86.133.48/29	100.86.133.48	100.86.133.49	100.86.133.54	100.86.133.55	6
8	100.86.133.56/29	100.86.133.56	100.86.133.57	100.86.133.62	100.86.133.63	6
9	100.86.133.64/29	100.86.133.64	100.86.133.65	100.86.133.70	100.86.133.71	6
10	100.86.133.72/29	100.86.133.72	100.86.133.73	100.86.133.78	100.86.133.79	6
11	100.86.133.80/29	100.86.133.80	100.86.133.81	100.86.133.86	100.86.133.87	6
12	100.86.133.88/29	100.86.133.88	100.86.133.89	100.86.133.94	100.86.133.95	6
13	100.86.133.96/29	100.86.133.96	100.86.133.97	100.86.133.102	100.86.133.103	6
14	100.86.133.104/29	100.86.133.104	100.86.133.105	100.86.133.110	100.86.133.111	6
15	100.86.133.112/29	100.86.133.112	100.86.133.113	100.86.133.118	100.86.133.119	6
16	100.86.133.120/29	100.86.133.120	100.86.133.121	100.86.133.126	100.86.133.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

100.86.133.0 net

100.86.133.1

100.86.133.2

100.86.133.3

100.86.133.4

100.86.133.5

100.86.133.6

100.86.133.7

100.86.133.8

100.86.133.9

100.86.133.10

100.86.133.11

100.86.133.12

100.86.133.13

100.86.133.14

100.86.133.15

… 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 100.86.133.0/24 Sibling /25 block 100.86.133.128/25

Adjacent Prefix Sizes

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