34.21.139.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

34.21.139.0

Broadcast Address

34.21.139.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

34.21.139.1

Last Usable IP

34.21.139.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (34.21.139.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 34.21.139.127 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	34.21.139.0/25
Network Address	34.21.139.0
Broadcast Address	34.21.139.127
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	34.21.139.1
Last Usable IP	34.21.139.126
Network (Hex)	0x22158B00
Broadcast (Hex)	0x22158B7F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00100010.00010101.10001011 00100010.00010101.10001011.00000000

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 34.21.139.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.21.139.0/26	34.21.139.0	34.21.139.1	34.21.139.62	34.21.139.63	62
2	34.21.139.64/26	34.21.139.64	34.21.139.65	34.21.139.126	34.21.139.127	62

Split 34.21.139.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.21.139.0/27	34.21.139.0	34.21.139.1	34.21.139.30	34.21.139.31	30
2	34.21.139.32/27	34.21.139.32	34.21.139.33	34.21.139.62	34.21.139.63	30
3	34.21.139.64/27	34.21.139.64	34.21.139.65	34.21.139.94	34.21.139.95	30
4	34.21.139.96/27	34.21.139.96	34.21.139.97	34.21.139.126	34.21.139.127	30

Split 34.21.139.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.21.139.0/28	34.21.139.0	34.21.139.1	34.21.139.14	34.21.139.15	14
2	34.21.139.16/28	34.21.139.16	34.21.139.17	34.21.139.30	34.21.139.31	14
3	34.21.139.32/28	34.21.139.32	34.21.139.33	34.21.139.46	34.21.139.47	14
4	34.21.139.48/28	34.21.139.48	34.21.139.49	34.21.139.62	34.21.139.63	14
5	34.21.139.64/28	34.21.139.64	34.21.139.65	34.21.139.78	34.21.139.79	14
6	34.21.139.80/28	34.21.139.80	34.21.139.81	34.21.139.94	34.21.139.95	14
7	34.21.139.96/28	34.21.139.96	34.21.139.97	34.21.139.110	34.21.139.111	14
8	34.21.139.112/28	34.21.139.112	34.21.139.113	34.21.139.126	34.21.139.127	14

Split 34.21.139.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	34.21.139.0/29	34.21.139.0	34.21.139.1	34.21.139.6	34.21.139.7	6
2	34.21.139.8/29	34.21.139.8	34.21.139.9	34.21.139.14	34.21.139.15	6
3	34.21.139.16/29	34.21.139.16	34.21.139.17	34.21.139.22	34.21.139.23	6
4	34.21.139.24/29	34.21.139.24	34.21.139.25	34.21.139.30	34.21.139.31	6
5	34.21.139.32/29	34.21.139.32	34.21.139.33	34.21.139.38	34.21.139.39	6
6	34.21.139.40/29	34.21.139.40	34.21.139.41	34.21.139.46	34.21.139.47	6
7	34.21.139.48/29	34.21.139.48	34.21.139.49	34.21.139.54	34.21.139.55	6
8	34.21.139.56/29	34.21.139.56	34.21.139.57	34.21.139.62	34.21.139.63	6
9	34.21.139.64/29	34.21.139.64	34.21.139.65	34.21.139.70	34.21.139.71	6
10	34.21.139.72/29	34.21.139.72	34.21.139.73	34.21.139.78	34.21.139.79	6
11	34.21.139.80/29	34.21.139.80	34.21.139.81	34.21.139.86	34.21.139.87	6
12	34.21.139.88/29	34.21.139.88	34.21.139.89	34.21.139.94	34.21.139.95	6
13	34.21.139.96/29	34.21.139.96	34.21.139.97	34.21.139.102	34.21.139.103	6
14	34.21.139.104/29	34.21.139.104	34.21.139.105	34.21.139.110	34.21.139.111	6
15	34.21.139.112/29	34.21.139.112	34.21.139.113	34.21.139.118	34.21.139.119	6
16	34.21.139.120/29	34.21.139.120	34.21.139.121	34.21.139.126	34.21.139.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

34.21.139.0 net

34.21.139.1

34.21.139.2

34.21.139.3

34.21.139.4

34.21.139.5

34.21.139.6

34.21.139.7

34.21.139.8

34.21.139.9

34.21.139.10

34.21.139.11

34.21.139.12

34.21.139.13

34.21.139.14

34.21.139.15

… 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 34.21.139.0/24 Sibling /25 block 34.21.139.128/25

Adjacent Prefix Sizes

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