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)10.3.79.0/25

network10.3.79.0/25

broadcast10.3.79.127

first host10.3.79.1

last host10.3.79.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.79.0/25

address00001010.00000011.01001111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.01001111.00000000

broadcast00001010.00000011.01001111.01111111

green = network part, grey = host part

hex0x0a034f00

decimal167988992

reverse dns0.79.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:4f00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.79.0/32	10.3.79.0 – 10.3.79.0	10.3.79.0
2	10.3.79.1/32	10.3.79.1 – 10.3.79.1	10.3.79.1
3	10.3.79.2/32	10.3.79.2 – 10.3.79.2	10.3.79.2
4	10.3.79.3/32	10.3.79.3 – 10.3.79.3	10.3.79.3
5	10.3.79.4/32	10.3.79.4 – 10.3.79.4	10.3.79.4
6	10.3.79.5/32	10.3.79.5 – 10.3.79.5	10.3.79.5
7	10.3.79.6/32	10.3.79.6 – 10.3.79.6	10.3.79.6
8	10.3.79.7/32	10.3.79.7 – 10.3.79.7	10.3.79.7
9	10.3.79.8/32	10.3.79.8 – 10.3.79.8	10.3.79.8
10	10.3.79.9/32	10.3.79.9 – 10.3.79.9	10.3.79.9
11	10.3.79.10/32	10.3.79.10 – 10.3.79.10	10.3.79.10
12	10.3.79.11/32	10.3.79.11 – 10.3.79.11	10.3.79.11
13	10.3.79.12/32	10.3.79.12 – 10.3.79.12	10.3.79.12
14	10.3.79.13/32	10.3.79.13 – 10.3.79.13	10.3.79.13
15	10.3.79.14/32	10.3.79.14 – 10.3.79.14	10.3.79.14
16	10.3.79.15/32	10.3.79.15 – 10.3.79.15	10.3.79.15
17	10.3.79.16/32	10.3.79.16 – 10.3.79.16	10.3.79.16
18	10.3.79.17/32	10.3.79.17 – 10.3.79.17	10.3.79.17
19	10.3.79.18/32	10.3.79.18 – 10.3.79.18	10.3.79.18
20	10.3.79.19/32	10.3.79.19 – 10.3.79.19	10.3.79.19
21	10.3.79.20/32	10.3.79.20 – 10.3.79.20	10.3.79.20
22	10.3.79.21/32	10.3.79.21 – 10.3.79.21	10.3.79.21
23	10.3.79.22/32	10.3.79.22 – 10.3.79.22	10.3.79.22
24	10.3.79.23/32	10.3.79.23 – 10.3.79.23	10.3.79.23
25	10.3.79.24/32	10.3.79.24 – 10.3.79.24	10.3.79.24
26	10.3.79.25/32	10.3.79.25 – 10.3.79.25	10.3.79.25
27	10.3.79.26/32	10.3.79.26 – 10.3.79.26	10.3.79.26
28	10.3.79.27/32	10.3.79.27 – 10.3.79.27	10.3.79.27
29	10.3.79.28/32	10.3.79.28 – 10.3.79.28	10.3.79.28
30	10.3.79.29/32	10.3.79.29 – 10.3.79.29	10.3.79.29
31	10.3.79.30/32	10.3.79.30 – 10.3.79.30	10.3.79.30
32	10.3.79.31/32	10.3.79.31 – 10.3.79.31	10.3.79.31
33	10.3.79.32/32	10.3.79.32 – 10.3.79.32	10.3.79.32
34	10.3.79.33/32	10.3.79.33 – 10.3.79.33	10.3.79.33
35	10.3.79.34/32	10.3.79.34 – 10.3.79.34	10.3.79.34
36	10.3.79.35/32	10.3.79.35 – 10.3.79.35	10.3.79.35
37	10.3.79.36/32	10.3.79.36 – 10.3.79.36	10.3.79.36
38	10.3.79.37/32	10.3.79.37 – 10.3.79.37	10.3.79.37
39	10.3.79.38/32	10.3.79.38 – 10.3.79.38	10.3.79.38
40	10.3.79.39/32	10.3.79.39 – 10.3.79.39	10.3.79.39
41	10.3.79.40/32	10.3.79.40 – 10.3.79.40	10.3.79.40
42	10.3.79.41/32	10.3.79.41 – 10.3.79.41	10.3.79.41
43	10.3.79.42/32	10.3.79.42 – 10.3.79.42	10.3.79.42
44	10.3.79.43/32	10.3.79.43 – 10.3.79.43	10.3.79.43
45	10.3.79.44/32	10.3.79.44 – 10.3.79.44	10.3.79.44
46	10.3.79.45/32	10.3.79.45 – 10.3.79.45	10.3.79.45
47	10.3.79.46/32	10.3.79.46 – 10.3.79.46	10.3.79.46
48	10.3.79.47/32	10.3.79.47 – 10.3.79.47	10.3.79.47
49	10.3.79.48/32	10.3.79.48 – 10.3.79.48	10.3.79.48
50	10.3.79.49/32	10.3.79.49 – 10.3.79.49	10.3.79.49
51	10.3.79.50/32	10.3.79.50 – 10.3.79.50	10.3.79.50
52	10.3.79.51/32	10.3.79.51 – 10.3.79.51	10.3.79.51
53	10.3.79.52/32	10.3.79.52 – 10.3.79.52	10.3.79.52
54	10.3.79.53/32	10.3.79.53 – 10.3.79.53	10.3.79.53
55	10.3.79.54/32	10.3.79.54 – 10.3.79.54	10.3.79.54
56	10.3.79.55/32	10.3.79.55 – 10.3.79.55	10.3.79.55
57	10.3.79.56/32	10.3.79.56 – 10.3.79.56	10.3.79.56
58	10.3.79.57/32	10.3.79.57 – 10.3.79.57	10.3.79.57
59	10.3.79.58/32	10.3.79.58 – 10.3.79.58	10.3.79.58
60	10.3.79.59/32	10.3.79.59 – 10.3.79.59	10.3.79.59
61	10.3.79.60/32	10.3.79.60 – 10.3.79.60	10.3.79.60
62	10.3.79.61/32	10.3.79.61 – 10.3.79.61	10.3.79.61
63	10.3.79.62/32	10.3.79.62 – 10.3.79.62	10.3.79.62
64	10.3.79.63/32	10.3.79.63 – 10.3.79.63	10.3.79.63
65	10.3.79.64/32	10.3.79.64 – 10.3.79.64	10.3.79.64
66	10.3.79.65/32	10.3.79.65 – 10.3.79.65	10.3.79.65
67	10.3.79.66/32	10.3.79.66 – 10.3.79.66	10.3.79.66
68	10.3.79.67/32	10.3.79.67 – 10.3.79.67	10.3.79.67
69	10.3.79.68/32	10.3.79.68 – 10.3.79.68	10.3.79.68
70	10.3.79.69/32	10.3.79.69 – 10.3.79.69	10.3.79.69
71	10.3.79.70/32	10.3.79.70 – 10.3.79.70	10.3.79.70
72	10.3.79.71/32	10.3.79.71 – 10.3.79.71	10.3.79.71
73	10.3.79.72/32	10.3.79.72 – 10.3.79.72	10.3.79.72
74	10.3.79.73/32	10.3.79.73 – 10.3.79.73	10.3.79.73
75	10.3.79.74/32	10.3.79.74 – 10.3.79.74	10.3.79.74
76	10.3.79.75/32	10.3.79.75 – 10.3.79.75	10.3.79.75
77	10.3.79.76/32	10.3.79.76 – 10.3.79.76	10.3.79.76
78	10.3.79.77/32	10.3.79.77 – 10.3.79.77	10.3.79.77
79	10.3.79.78/32	10.3.79.78 – 10.3.79.78	10.3.79.78
80	10.3.79.79/32	10.3.79.79 – 10.3.79.79	10.3.79.79
81	10.3.79.80/32	10.3.79.80 – 10.3.79.80	10.3.79.80
82	10.3.79.81/32	10.3.79.81 – 10.3.79.81	10.3.79.81
83	10.3.79.82/32	10.3.79.82 – 10.3.79.82	10.3.79.82
84	10.3.79.83/32	10.3.79.83 – 10.3.79.83	10.3.79.83
85	10.3.79.84/32	10.3.79.84 – 10.3.79.84	10.3.79.84
86	10.3.79.85/32	10.3.79.85 – 10.3.79.85	10.3.79.85
87	10.3.79.86/32	10.3.79.86 – 10.3.79.86	10.3.79.86
88	10.3.79.87/32	10.3.79.87 – 10.3.79.87	10.3.79.87
89	10.3.79.88/32	10.3.79.88 – 10.3.79.88	10.3.79.88
90	10.3.79.89/32	10.3.79.89 – 10.3.79.89	10.3.79.89
91	10.3.79.90/32	10.3.79.90 – 10.3.79.90	10.3.79.90
92	10.3.79.91/32	10.3.79.91 – 10.3.79.91	10.3.79.91
93	10.3.79.92/32	10.3.79.92 – 10.3.79.92	10.3.79.92
94	10.3.79.93/32	10.3.79.93 – 10.3.79.93	10.3.79.93
95	10.3.79.94/32	10.3.79.94 – 10.3.79.94	10.3.79.94
96	10.3.79.95/32	10.3.79.95 – 10.3.79.95	10.3.79.95
97	10.3.79.96/32	10.3.79.96 – 10.3.79.96	10.3.79.96
98	10.3.79.97/32	10.3.79.97 – 10.3.79.97	10.3.79.97
99	10.3.79.98/32	10.3.79.98 – 10.3.79.98	10.3.79.98
100	10.3.79.99/32	10.3.79.99 – 10.3.79.99	10.3.79.99
101	10.3.79.100/32	10.3.79.100 – 10.3.79.100	10.3.79.100
102	10.3.79.101/32	10.3.79.101 – 10.3.79.101	10.3.79.101
103	10.3.79.102/32	10.3.79.102 – 10.3.79.102	10.3.79.102
104	10.3.79.103/32	10.3.79.103 – 10.3.79.103	10.3.79.103
105	10.3.79.104/32	10.3.79.104 – 10.3.79.104	10.3.79.104
106	10.3.79.105/32	10.3.79.105 – 10.3.79.105	10.3.79.105
107	10.3.79.106/32	10.3.79.106 – 10.3.79.106	10.3.79.106
108	10.3.79.107/32	10.3.79.107 – 10.3.79.107	10.3.79.107
109	10.3.79.108/32	10.3.79.108 – 10.3.79.108	10.3.79.108
110	10.3.79.109/32	10.3.79.109 – 10.3.79.109	10.3.79.109
111	10.3.79.110/32	10.3.79.110 – 10.3.79.110	10.3.79.110
112	10.3.79.111/32	10.3.79.111 – 10.3.79.111	10.3.79.111
113	10.3.79.112/32	10.3.79.112 – 10.3.79.112	10.3.79.112
114	10.3.79.113/32	10.3.79.113 – 10.3.79.113	10.3.79.113
115	10.3.79.114/32	10.3.79.114 – 10.3.79.114	10.3.79.114
116	10.3.79.115/32	10.3.79.115 – 10.3.79.115	10.3.79.115
117	10.3.79.116/32	10.3.79.116 – 10.3.79.116	10.3.79.116
118	10.3.79.117/32	10.3.79.117 – 10.3.79.117	10.3.79.117
119	10.3.79.118/32	10.3.79.118 – 10.3.79.118	10.3.79.118
120	10.3.79.119/32	10.3.79.119 – 10.3.79.119	10.3.79.119
121	10.3.79.120/32	10.3.79.120 – 10.3.79.120	10.3.79.120
122	10.3.79.121/32	10.3.79.121 – 10.3.79.121	10.3.79.121
123	10.3.79.122/32	10.3.79.122 – 10.3.79.122	10.3.79.122
124	10.3.79.123/32	10.3.79.123 – 10.3.79.123	10.3.79.123
125	10.3.79.124/32	10.3.79.124 – 10.3.79.124	10.3.79.124
126	10.3.79.125/32	10.3.79.125 – 10.3.79.125	10.3.79.125
127	10.3.79.126/32	10.3.79.126 – 10.3.79.126	10.3.79.126
128	10.3.79.127/32	10.3.79.127 – 10.3.79.127	10.3.79.127

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 →