1.72.249.0/25

Public

Class A — /25 prefix — 126 usable hosts

Network Address

1.72.249.0

Broadcast Address

1.72.249.127

Subnet Mask

255.255.255.128

Usable Hosts

126

First Usable IP

1.72.249.1

Last Usable IP

1.72.249.126

Total IPs

128

Prefix Length

/25

Network address — the base address of the block (1.72.249.0). All devices in this subnet share this prefix. Cannot be assigned to a host.

Broadcast address — packets sent to 1.72.249.127 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	1.72.249.0/25
Network Address	1.72.249.0
Broadcast Address	1.72.249.127
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	1.72.249.1
Last Usable IP	1.72.249.126
Network (Hex)	0x0148F900
Broadcast (Hex)	0x0148F97F
Address Type	Public / Globally Routable

Binary Representation

Network Address

00000001.01001000.11111001 00000001.01001000.11111001.00000000

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 1.72.249.0/25 into 2 equal /26 subnets (62 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.72.249.0/26	1.72.249.0	1.72.249.1	1.72.249.62	1.72.249.63	62
2	1.72.249.64/26	1.72.249.64	1.72.249.65	1.72.249.126	1.72.249.127	62

Split 1.72.249.0/25 into 4 equal /27 subnets (30 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.72.249.0/27	1.72.249.0	1.72.249.1	1.72.249.30	1.72.249.31	30
2	1.72.249.32/27	1.72.249.32	1.72.249.33	1.72.249.62	1.72.249.63	30
3	1.72.249.64/27	1.72.249.64	1.72.249.65	1.72.249.94	1.72.249.95	30
4	1.72.249.96/27	1.72.249.96	1.72.249.97	1.72.249.126	1.72.249.127	30

Split 1.72.249.0/25 into 8 equal /28 subnets (14 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.72.249.0/28	1.72.249.0	1.72.249.1	1.72.249.14	1.72.249.15	14
2	1.72.249.16/28	1.72.249.16	1.72.249.17	1.72.249.30	1.72.249.31	14
3	1.72.249.32/28	1.72.249.32	1.72.249.33	1.72.249.46	1.72.249.47	14
4	1.72.249.48/28	1.72.249.48	1.72.249.49	1.72.249.62	1.72.249.63	14
5	1.72.249.64/28	1.72.249.64	1.72.249.65	1.72.249.78	1.72.249.79	14
6	1.72.249.80/28	1.72.249.80	1.72.249.81	1.72.249.94	1.72.249.95	14
7	1.72.249.96/28	1.72.249.96	1.72.249.97	1.72.249.110	1.72.249.111	14
8	1.72.249.112/28	1.72.249.112	1.72.249.113	1.72.249.126	1.72.249.127	14

Split 1.72.249.0/25 into 16 equal /29 subnets (6 usable hosts each).

#	CIDR	Network	First Usable	Last Usable	Broadcast	Hosts
1	1.72.249.0/29	1.72.249.0	1.72.249.1	1.72.249.6	1.72.249.7	6
2	1.72.249.8/29	1.72.249.8	1.72.249.9	1.72.249.14	1.72.249.15	6
3	1.72.249.16/29	1.72.249.16	1.72.249.17	1.72.249.22	1.72.249.23	6
4	1.72.249.24/29	1.72.249.24	1.72.249.25	1.72.249.30	1.72.249.31	6
5	1.72.249.32/29	1.72.249.32	1.72.249.33	1.72.249.38	1.72.249.39	6
6	1.72.249.40/29	1.72.249.40	1.72.249.41	1.72.249.46	1.72.249.47	6
7	1.72.249.48/29	1.72.249.48	1.72.249.49	1.72.249.54	1.72.249.55	6
8	1.72.249.56/29	1.72.249.56	1.72.249.57	1.72.249.62	1.72.249.63	6
9	1.72.249.64/29	1.72.249.64	1.72.249.65	1.72.249.70	1.72.249.71	6
10	1.72.249.72/29	1.72.249.72	1.72.249.73	1.72.249.78	1.72.249.79	6
11	1.72.249.80/29	1.72.249.80	1.72.249.81	1.72.249.86	1.72.249.87	6
12	1.72.249.88/29	1.72.249.88	1.72.249.89	1.72.249.94	1.72.249.95	6
13	1.72.249.96/29	1.72.249.96	1.72.249.97	1.72.249.102	1.72.249.103	6
14	1.72.249.104/29	1.72.249.104	1.72.249.105	1.72.249.110	1.72.249.111	6
15	1.72.249.112/29	1.72.249.112	1.72.249.113	1.72.249.118	1.72.249.119	6
16	1.72.249.120/29	1.72.249.120	1.72.249.121	1.72.249.126	1.72.249.127	6

IP Address Sample

Showing first 16 of 128 total IPs.

1.72.249.0 net

1.72.249.1

1.72.249.2

1.72.249.3

1.72.249.4

1.72.249.5

1.72.249.6

1.72.249.7

1.72.249.8

1.72.249.9

1.72.249.10

1.72.249.11

1.72.249.12

1.72.249.13

1.72.249.14

1.72.249.15

… 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 1.72.249.0/24 Sibling /25 block 1.72.249.128/25

Adjacent Prefix Sizes

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