28.109.64.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

28.109.64.0

Broadcast Address

28.109.64.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

28.109.64.1

Last Usable IP

28.109.64.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (28.109.64.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 28.109.64.127 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	28.109.64.0/25
Network Address	28.109.64.0
Broadcast Address	28.109.64.127
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	28.109.64.1
Last Usable IP	28.109.64.126
Network (Hex)	0x1C6D4000
Broadcast (Hex)	0x1C6D407F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00011100.01101101.01000000 00011100.01101101.01000000.00000000

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 28.109.64.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.109.64.0/26	28.109.64.0	28.109.64.1	28.109.64.62	28.109.64.63	62
2	28.109.64.64/26	28.109.64.64	28.109.64.65	28.109.64.126	28.109.64.127	62

Split 28.109.64.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.109.64.0/27	28.109.64.0	28.109.64.1	28.109.64.30	28.109.64.31	30
2	28.109.64.32/27	28.109.64.32	28.109.64.33	28.109.64.62	28.109.64.63	30
3	28.109.64.64/27	28.109.64.64	28.109.64.65	28.109.64.94	28.109.64.95	30
4	28.109.64.96/27	28.109.64.96	28.109.64.97	28.109.64.126	28.109.64.127	30

Split 28.109.64.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.109.64.0/28	28.109.64.0	28.109.64.1	28.109.64.14	28.109.64.15	14
2	28.109.64.16/28	28.109.64.16	28.109.64.17	28.109.64.30	28.109.64.31	14
3	28.109.64.32/28	28.109.64.32	28.109.64.33	28.109.64.46	28.109.64.47	14
4	28.109.64.48/28	28.109.64.48	28.109.64.49	28.109.64.62	28.109.64.63	14
5	28.109.64.64/28	28.109.64.64	28.109.64.65	28.109.64.78	28.109.64.79	14
6	28.109.64.80/28	28.109.64.80	28.109.64.81	28.109.64.94	28.109.64.95	14
7	28.109.64.96/28	28.109.64.96	28.109.64.97	28.109.64.110	28.109.64.111	14
8	28.109.64.112/28	28.109.64.112	28.109.64.113	28.109.64.126	28.109.64.127	14

Split 28.109.64.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	28.109.64.0/29	28.109.64.0	28.109.64.1	28.109.64.6	28.109.64.7	6
2	28.109.64.8/29	28.109.64.8	28.109.64.9	28.109.64.14	28.109.64.15	6
3	28.109.64.16/29	28.109.64.16	28.109.64.17	28.109.64.22	28.109.64.23	6
4	28.109.64.24/29	28.109.64.24	28.109.64.25	28.109.64.30	28.109.64.31	6
5	28.109.64.32/29	28.109.64.32	28.109.64.33	28.109.64.38	28.109.64.39	6
6	28.109.64.40/29	28.109.64.40	28.109.64.41	28.109.64.46	28.109.64.47	6
7	28.109.64.48/29	28.109.64.48	28.109.64.49	28.109.64.54	28.109.64.55	6
8	28.109.64.56/29	28.109.64.56	28.109.64.57	28.109.64.62	28.109.64.63	6
9	28.109.64.64/29	28.109.64.64	28.109.64.65	28.109.64.70	28.109.64.71	6
10	28.109.64.72/29	28.109.64.72	28.109.64.73	28.109.64.78	28.109.64.79	6
11	28.109.64.80/29	28.109.64.80	28.109.64.81	28.109.64.86	28.109.64.87	6
12	28.109.64.88/29	28.109.64.88	28.109.64.89	28.109.64.94	28.109.64.95	6
13	28.109.64.96/29	28.109.64.96	28.109.64.97	28.109.64.102	28.109.64.103	6
14	28.109.64.104/29	28.109.64.104	28.109.64.105	28.109.64.110	28.109.64.111	6
15	28.109.64.112/29	28.109.64.112	28.109.64.113	28.109.64.118	28.109.64.119	6
16	28.109.64.120/29	28.109.64.120	28.109.64.121	28.109.64.126	28.109.64.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

28.109.64.0 net

28.109.64.1

28.109.64.2

28.109.64.3

28.109.64.4

28.109.64.5

28.109.64.6

28.109.64.7

28.109.64.8

28.109.64.9

28.109.64.10

28.109.64.11

28.109.64.12

28.109.64.13

28.109.64.14

28.109.64.15

… 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 28.109.64.0/24 Sibling /25 block 28.109.64.128/25

Adjacent Prefix Sizes

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