34.1.91.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

34.1.91.0

Broadcast Address

34.1.91.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

34.1.91.1

Last Usable IP

34.1.91.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (34.1.91.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 34.1.91.127 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	34.1.91.0/25
Network Address	34.1.91.0
Broadcast Address	34.1.91.127
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	34.1.91.1
Last Usable IP	34.1.91.126
Network (Hex)	0x22015B00
Broadcast (Hex)	0x22015B7F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00100010.00000001.01011011 00100010.00000001.01011011.00000000

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 34.1.91.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.1.91.0/26	34.1.91.0	34.1.91.1	34.1.91.62	34.1.91.63	62
2	34.1.91.64/26	34.1.91.64	34.1.91.65	34.1.91.126	34.1.91.127	62

Split 34.1.91.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.1.91.0/27	34.1.91.0	34.1.91.1	34.1.91.30	34.1.91.31	30
2	34.1.91.32/27	34.1.91.32	34.1.91.33	34.1.91.62	34.1.91.63	30
3	34.1.91.64/27	34.1.91.64	34.1.91.65	34.1.91.94	34.1.91.95	30
4	34.1.91.96/27	34.1.91.96	34.1.91.97	34.1.91.126	34.1.91.127	30

Split 34.1.91.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.1.91.0/28	34.1.91.0	34.1.91.1	34.1.91.14	34.1.91.15	14
2	34.1.91.16/28	34.1.91.16	34.1.91.17	34.1.91.30	34.1.91.31	14
3	34.1.91.32/28	34.1.91.32	34.1.91.33	34.1.91.46	34.1.91.47	14
4	34.1.91.48/28	34.1.91.48	34.1.91.49	34.1.91.62	34.1.91.63	14
5	34.1.91.64/28	34.1.91.64	34.1.91.65	34.1.91.78	34.1.91.79	14
6	34.1.91.80/28	34.1.91.80	34.1.91.81	34.1.91.94	34.1.91.95	14
7	34.1.91.96/28	34.1.91.96	34.1.91.97	34.1.91.110	34.1.91.111	14
8	34.1.91.112/28	34.1.91.112	34.1.91.113	34.1.91.126	34.1.91.127	14

Split 34.1.91.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.1.91.0/29	34.1.91.0	34.1.91.1	34.1.91.6	34.1.91.7	6
2	34.1.91.8/29	34.1.91.8	34.1.91.9	34.1.91.14	34.1.91.15	6
3	34.1.91.16/29	34.1.91.16	34.1.91.17	34.1.91.22	34.1.91.23	6
4	34.1.91.24/29	34.1.91.24	34.1.91.25	34.1.91.30	34.1.91.31	6
5	34.1.91.32/29	34.1.91.32	34.1.91.33	34.1.91.38	34.1.91.39	6
6	34.1.91.40/29	34.1.91.40	34.1.91.41	34.1.91.46	34.1.91.47	6
7	34.1.91.48/29	34.1.91.48	34.1.91.49	34.1.91.54	34.1.91.55	6
8	34.1.91.56/29	34.1.91.56	34.1.91.57	34.1.91.62	34.1.91.63	6
9	34.1.91.64/29	34.1.91.64	34.1.91.65	34.1.91.70	34.1.91.71	6
10	34.1.91.72/29	34.1.91.72	34.1.91.73	34.1.91.78	34.1.91.79	6
11	34.1.91.80/29	34.1.91.80	34.1.91.81	34.1.91.86	34.1.91.87	6
12	34.1.91.88/29	34.1.91.88	34.1.91.89	34.1.91.94	34.1.91.95	6
13	34.1.91.96/29	34.1.91.96	34.1.91.97	34.1.91.102	34.1.91.103	6
14	34.1.91.104/29	34.1.91.104	34.1.91.105	34.1.91.110	34.1.91.111	6
15	34.1.91.112/29	34.1.91.112	34.1.91.113	34.1.91.118	34.1.91.119	6
16	34.1.91.120/29	34.1.91.120	34.1.91.121	34.1.91.126	34.1.91.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

34.1.91.0 net

34.1.91.1

34.1.91.2

34.1.91.3

34.1.91.4

34.1.91.5

34.1.91.6

34.1.91.7

34.1.91.8

34.1.91.9

34.1.91.10

34.1.91.11

34.1.91.12

34.1.91.13

34.1.91.14

34.1.91.15

… 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 34.1.91.0/24 Sibling /25 block 34.1.91.128/25

Adjacent Prefix Sizes

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