IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.232.72.0/25

network10.232.72.0/25

broadcast10.232.72.127

first host10.232.72.1

last host10.232.72.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.232.72.0/25

address00001010.11101000.01001000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.11101000.01001000.00000000

broadcast00001010.11101000.01001000.01111111

green = network part, grey = host part

hex0x0ae84800

decimal182994944

reverse dns0.72.232.10.in-addr.arpa

ipv4-mapped::ffff:ae8:4800

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.232.72.0/32	10.232.72.0 – 10.232.72.0	10.232.72.0
2	10.232.72.1/32	10.232.72.1 – 10.232.72.1	10.232.72.1
3	10.232.72.2/32	10.232.72.2 – 10.232.72.2	10.232.72.2
4	10.232.72.3/32	10.232.72.3 – 10.232.72.3	10.232.72.3
5	10.232.72.4/32	10.232.72.4 – 10.232.72.4	10.232.72.4
6	10.232.72.5/32	10.232.72.5 – 10.232.72.5	10.232.72.5
7	10.232.72.6/32	10.232.72.6 – 10.232.72.6	10.232.72.6
8	10.232.72.7/32	10.232.72.7 – 10.232.72.7	10.232.72.7
9	10.232.72.8/32	10.232.72.8 – 10.232.72.8	10.232.72.8
10	10.232.72.9/32	10.232.72.9 – 10.232.72.9	10.232.72.9
11	10.232.72.10/32	10.232.72.10 – 10.232.72.10	10.232.72.10
12	10.232.72.11/32	10.232.72.11 – 10.232.72.11	10.232.72.11
13	10.232.72.12/32	10.232.72.12 – 10.232.72.12	10.232.72.12
14	10.232.72.13/32	10.232.72.13 – 10.232.72.13	10.232.72.13
15	10.232.72.14/32	10.232.72.14 – 10.232.72.14	10.232.72.14
16	10.232.72.15/32	10.232.72.15 – 10.232.72.15	10.232.72.15
17	10.232.72.16/32	10.232.72.16 – 10.232.72.16	10.232.72.16
18	10.232.72.17/32	10.232.72.17 – 10.232.72.17	10.232.72.17
19	10.232.72.18/32	10.232.72.18 – 10.232.72.18	10.232.72.18
20	10.232.72.19/32	10.232.72.19 – 10.232.72.19	10.232.72.19
21	10.232.72.20/32	10.232.72.20 – 10.232.72.20	10.232.72.20
22	10.232.72.21/32	10.232.72.21 – 10.232.72.21	10.232.72.21
23	10.232.72.22/32	10.232.72.22 – 10.232.72.22	10.232.72.22
24	10.232.72.23/32	10.232.72.23 – 10.232.72.23	10.232.72.23
25	10.232.72.24/32	10.232.72.24 – 10.232.72.24	10.232.72.24
26	10.232.72.25/32	10.232.72.25 – 10.232.72.25	10.232.72.25
27	10.232.72.26/32	10.232.72.26 – 10.232.72.26	10.232.72.26
28	10.232.72.27/32	10.232.72.27 – 10.232.72.27	10.232.72.27
29	10.232.72.28/32	10.232.72.28 – 10.232.72.28	10.232.72.28
30	10.232.72.29/32	10.232.72.29 – 10.232.72.29	10.232.72.29
31	10.232.72.30/32	10.232.72.30 – 10.232.72.30	10.232.72.30
32	10.232.72.31/32	10.232.72.31 – 10.232.72.31	10.232.72.31
33	10.232.72.32/32	10.232.72.32 – 10.232.72.32	10.232.72.32
34	10.232.72.33/32	10.232.72.33 – 10.232.72.33	10.232.72.33
35	10.232.72.34/32	10.232.72.34 – 10.232.72.34	10.232.72.34
36	10.232.72.35/32	10.232.72.35 – 10.232.72.35	10.232.72.35
37	10.232.72.36/32	10.232.72.36 – 10.232.72.36	10.232.72.36
38	10.232.72.37/32	10.232.72.37 – 10.232.72.37	10.232.72.37
39	10.232.72.38/32	10.232.72.38 – 10.232.72.38	10.232.72.38
40	10.232.72.39/32	10.232.72.39 – 10.232.72.39	10.232.72.39
41	10.232.72.40/32	10.232.72.40 – 10.232.72.40	10.232.72.40
42	10.232.72.41/32	10.232.72.41 – 10.232.72.41	10.232.72.41
43	10.232.72.42/32	10.232.72.42 – 10.232.72.42	10.232.72.42
44	10.232.72.43/32	10.232.72.43 – 10.232.72.43	10.232.72.43
45	10.232.72.44/32	10.232.72.44 – 10.232.72.44	10.232.72.44
46	10.232.72.45/32	10.232.72.45 – 10.232.72.45	10.232.72.45
47	10.232.72.46/32	10.232.72.46 – 10.232.72.46	10.232.72.46
48	10.232.72.47/32	10.232.72.47 – 10.232.72.47	10.232.72.47
49	10.232.72.48/32	10.232.72.48 – 10.232.72.48	10.232.72.48
50	10.232.72.49/32	10.232.72.49 – 10.232.72.49	10.232.72.49
51	10.232.72.50/32	10.232.72.50 – 10.232.72.50	10.232.72.50
52	10.232.72.51/32	10.232.72.51 – 10.232.72.51	10.232.72.51
53	10.232.72.52/32	10.232.72.52 – 10.232.72.52	10.232.72.52
54	10.232.72.53/32	10.232.72.53 – 10.232.72.53	10.232.72.53
55	10.232.72.54/32	10.232.72.54 – 10.232.72.54	10.232.72.54
56	10.232.72.55/32	10.232.72.55 – 10.232.72.55	10.232.72.55
57	10.232.72.56/32	10.232.72.56 – 10.232.72.56	10.232.72.56
58	10.232.72.57/32	10.232.72.57 – 10.232.72.57	10.232.72.57
59	10.232.72.58/32	10.232.72.58 – 10.232.72.58	10.232.72.58
60	10.232.72.59/32	10.232.72.59 – 10.232.72.59	10.232.72.59
61	10.232.72.60/32	10.232.72.60 – 10.232.72.60	10.232.72.60
62	10.232.72.61/32	10.232.72.61 – 10.232.72.61	10.232.72.61
63	10.232.72.62/32	10.232.72.62 – 10.232.72.62	10.232.72.62
64	10.232.72.63/32	10.232.72.63 – 10.232.72.63	10.232.72.63
65	10.232.72.64/32	10.232.72.64 – 10.232.72.64	10.232.72.64
66	10.232.72.65/32	10.232.72.65 – 10.232.72.65	10.232.72.65
67	10.232.72.66/32	10.232.72.66 – 10.232.72.66	10.232.72.66
68	10.232.72.67/32	10.232.72.67 – 10.232.72.67	10.232.72.67
69	10.232.72.68/32	10.232.72.68 – 10.232.72.68	10.232.72.68
70	10.232.72.69/32	10.232.72.69 – 10.232.72.69	10.232.72.69
71	10.232.72.70/32	10.232.72.70 – 10.232.72.70	10.232.72.70
72	10.232.72.71/32	10.232.72.71 – 10.232.72.71	10.232.72.71
73	10.232.72.72/32	10.232.72.72 – 10.232.72.72	10.232.72.72
74	10.232.72.73/32	10.232.72.73 – 10.232.72.73	10.232.72.73
75	10.232.72.74/32	10.232.72.74 – 10.232.72.74	10.232.72.74
76	10.232.72.75/32	10.232.72.75 – 10.232.72.75	10.232.72.75
77	10.232.72.76/32	10.232.72.76 – 10.232.72.76	10.232.72.76
78	10.232.72.77/32	10.232.72.77 – 10.232.72.77	10.232.72.77
79	10.232.72.78/32	10.232.72.78 – 10.232.72.78	10.232.72.78
80	10.232.72.79/32	10.232.72.79 – 10.232.72.79	10.232.72.79
81	10.232.72.80/32	10.232.72.80 – 10.232.72.80	10.232.72.80
82	10.232.72.81/32	10.232.72.81 – 10.232.72.81	10.232.72.81
83	10.232.72.82/32	10.232.72.82 – 10.232.72.82	10.232.72.82
84	10.232.72.83/32	10.232.72.83 – 10.232.72.83	10.232.72.83
85	10.232.72.84/32	10.232.72.84 – 10.232.72.84	10.232.72.84
86	10.232.72.85/32	10.232.72.85 – 10.232.72.85	10.232.72.85
87	10.232.72.86/32	10.232.72.86 – 10.232.72.86	10.232.72.86
88	10.232.72.87/32	10.232.72.87 – 10.232.72.87	10.232.72.87
89	10.232.72.88/32	10.232.72.88 – 10.232.72.88	10.232.72.88
90	10.232.72.89/32	10.232.72.89 – 10.232.72.89	10.232.72.89
91	10.232.72.90/32	10.232.72.90 – 10.232.72.90	10.232.72.90
92	10.232.72.91/32	10.232.72.91 – 10.232.72.91	10.232.72.91
93	10.232.72.92/32	10.232.72.92 – 10.232.72.92	10.232.72.92
94	10.232.72.93/32	10.232.72.93 – 10.232.72.93	10.232.72.93
95	10.232.72.94/32	10.232.72.94 – 10.232.72.94	10.232.72.94
96	10.232.72.95/32	10.232.72.95 – 10.232.72.95	10.232.72.95
97	10.232.72.96/32	10.232.72.96 – 10.232.72.96	10.232.72.96
98	10.232.72.97/32	10.232.72.97 – 10.232.72.97	10.232.72.97
99	10.232.72.98/32	10.232.72.98 – 10.232.72.98	10.232.72.98
100	10.232.72.99/32	10.232.72.99 – 10.232.72.99	10.232.72.99
101	10.232.72.100/32	10.232.72.100 – 10.232.72.100	10.232.72.100
102	10.232.72.101/32	10.232.72.101 – 10.232.72.101	10.232.72.101
103	10.232.72.102/32	10.232.72.102 – 10.232.72.102	10.232.72.102
104	10.232.72.103/32	10.232.72.103 – 10.232.72.103	10.232.72.103
105	10.232.72.104/32	10.232.72.104 – 10.232.72.104	10.232.72.104
106	10.232.72.105/32	10.232.72.105 – 10.232.72.105	10.232.72.105
107	10.232.72.106/32	10.232.72.106 – 10.232.72.106	10.232.72.106
108	10.232.72.107/32	10.232.72.107 – 10.232.72.107	10.232.72.107
109	10.232.72.108/32	10.232.72.108 – 10.232.72.108	10.232.72.108
110	10.232.72.109/32	10.232.72.109 – 10.232.72.109	10.232.72.109
111	10.232.72.110/32	10.232.72.110 – 10.232.72.110	10.232.72.110
112	10.232.72.111/32	10.232.72.111 – 10.232.72.111	10.232.72.111
113	10.232.72.112/32	10.232.72.112 – 10.232.72.112	10.232.72.112
114	10.232.72.113/32	10.232.72.113 – 10.232.72.113	10.232.72.113
115	10.232.72.114/32	10.232.72.114 – 10.232.72.114	10.232.72.114
116	10.232.72.115/32	10.232.72.115 – 10.232.72.115	10.232.72.115
117	10.232.72.116/32	10.232.72.116 – 10.232.72.116	10.232.72.116
118	10.232.72.117/32	10.232.72.117 – 10.232.72.117	10.232.72.117
119	10.232.72.118/32	10.232.72.118 – 10.232.72.118	10.232.72.118
120	10.232.72.119/32	10.232.72.119 – 10.232.72.119	10.232.72.119
121	10.232.72.120/32	10.232.72.120 – 10.232.72.120	10.232.72.120
122	10.232.72.121/32	10.232.72.121 – 10.232.72.121	10.232.72.121
123	10.232.72.122/32	10.232.72.122 – 10.232.72.122	10.232.72.122
124	10.232.72.123/32	10.232.72.123 – 10.232.72.123	10.232.72.123
125	10.232.72.124/32	10.232.72.124 – 10.232.72.124	10.232.72.124
126	10.232.72.125/32	10.232.72.125 – 10.232.72.125	10.232.72.125
127	10.232.72.126/32	10.232.72.126 – 10.232.72.126	10.232.72.126
128	10.232.72.127/32	10.232.72.127 – 10.232.72.127	10.232.72.127

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /25
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	1
/26	255.255.255.192	64	62	2 split →
/27	255.255.255.224	32	30	4 split →
/28	255.255.255.240	16	14	8 split →
/29	255.255.255.248	8	6	16 split →
/30	255.255.255.252	4	2	32 split →
/31	255.255.255.254	2	2	64 split →
/32	255.255.255.255	1	1	128 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →