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)10.3.192.0/25

network10.3.192.0/25

broadcast10.3.192.127

first host10.3.192.1

last host10.3.192.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.192.0/25

address00001010.00000011.11000000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.11000000.00000000

broadcast00001010.00000011.11000000.01111111

green = network part, grey = host part

hex0x0a03c000

decimal168017920

reverse dns0.192.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:c000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.192.0/32	10.3.192.0 – 10.3.192.0	10.3.192.0
2	10.3.192.1/32	10.3.192.1 – 10.3.192.1	10.3.192.1
3	10.3.192.2/32	10.3.192.2 – 10.3.192.2	10.3.192.2
4	10.3.192.3/32	10.3.192.3 – 10.3.192.3	10.3.192.3
5	10.3.192.4/32	10.3.192.4 – 10.3.192.4	10.3.192.4
6	10.3.192.5/32	10.3.192.5 – 10.3.192.5	10.3.192.5
7	10.3.192.6/32	10.3.192.6 – 10.3.192.6	10.3.192.6
8	10.3.192.7/32	10.3.192.7 – 10.3.192.7	10.3.192.7
9	10.3.192.8/32	10.3.192.8 – 10.3.192.8	10.3.192.8
10	10.3.192.9/32	10.3.192.9 – 10.3.192.9	10.3.192.9
11	10.3.192.10/32	10.3.192.10 – 10.3.192.10	10.3.192.10
12	10.3.192.11/32	10.3.192.11 – 10.3.192.11	10.3.192.11
13	10.3.192.12/32	10.3.192.12 – 10.3.192.12	10.3.192.12
14	10.3.192.13/32	10.3.192.13 – 10.3.192.13	10.3.192.13
15	10.3.192.14/32	10.3.192.14 – 10.3.192.14	10.3.192.14
16	10.3.192.15/32	10.3.192.15 – 10.3.192.15	10.3.192.15
17	10.3.192.16/32	10.3.192.16 – 10.3.192.16	10.3.192.16
18	10.3.192.17/32	10.3.192.17 – 10.3.192.17	10.3.192.17
19	10.3.192.18/32	10.3.192.18 – 10.3.192.18	10.3.192.18
20	10.3.192.19/32	10.3.192.19 – 10.3.192.19	10.3.192.19
21	10.3.192.20/32	10.3.192.20 – 10.3.192.20	10.3.192.20
22	10.3.192.21/32	10.3.192.21 – 10.3.192.21	10.3.192.21
23	10.3.192.22/32	10.3.192.22 – 10.3.192.22	10.3.192.22
24	10.3.192.23/32	10.3.192.23 – 10.3.192.23	10.3.192.23
25	10.3.192.24/32	10.3.192.24 – 10.3.192.24	10.3.192.24
26	10.3.192.25/32	10.3.192.25 – 10.3.192.25	10.3.192.25
27	10.3.192.26/32	10.3.192.26 – 10.3.192.26	10.3.192.26
28	10.3.192.27/32	10.3.192.27 – 10.3.192.27	10.3.192.27
29	10.3.192.28/32	10.3.192.28 – 10.3.192.28	10.3.192.28
30	10.3.192.29/32	10.3.192.29 – 10.3.192.29	10.3.192.29
31	10.3.192.30/32	10.3.192.30 – 10.3.192.30	10.3.192.30
32	10.3.192.31/32	10.3.192.31 – 10.3.192.31	10.3.192.31
33	10.3.192.32/32	10.3.192.32 – 10.3.192.32	10.3.192.32
34	10.3.192.33/32	10.3.192.33 – 10.3.192.33	10.3.192.33
35	10.3.192.34/32	10.3.192.34 – 10.3.192.34	10.3.192.34
36	10.3.192.35/32	10.3.192.35 – 10.3.192.35	10.3.192.35
37	10.3.192.36/32	10.3.192.36 – 10.3.192.36	10.3.192.36
38	10.3.192.37/32	10.3.192.37 – 10.3.192.37	10.3.192.37
39	10.3.192.38/32	10.3.192.38 – 10.3.192.38	10.3.192.38
40	10.3.192.39/32	10.3.192.39 – 10.3.192.39	10.3.192.39
41	10.3.192.40/32	10.3.192.40 – 10.3.192.40	10.3.192.40
42	10.3.192.41/32	10.3.192.41 – 10.3.192.41	10.3.192.41
43	10.3.192.42/32	10.3.192.42 – 10.3.192.42	10.3.192.42
44	10.3.192.43/32	10.3.192.43 – 10.3.192.43	10.3.192.43
45	10.3.192.44/32	10.3.192.44 – 10.3.192.44	10.3.192.44
46	10.3.192.45/32	10.3.192.45 – 10.3.192.45	10.3.192.45
47	10.3.192.46/32	10.3.192.46 – 10.3.192.46	10.3.192.46
48	10.3.192.47/32	10.3.192.47 – 10.3.192.47	10.3.192.47
49	10.3.192.48/32	10.3.192.48 – 10.3.192.48	10.3.192.48
50	10.3.192.49/32	10.3.192.49 – 10.3.192.49	10.3.192.49
51	10.3.192.50/32	10.3.192.50 – 10.3.192.50	10.3.192.50
52	10.3.192.51/32	10.3.192.51 – 10.3.192.51	10.3.192.51
53	10.3.192.52/32	10.3.192.52 – 10.3.192.52	10.3.192.52
54	10.3.192.53/32	10.3.192.53 – 10.3.192.53	10.3.192.53
55	10.3.192.54/32	10.3.192.54 – 10.3.192.54	10.3.192.54
56	10.3.192.55/32	10.3.192.55 – 10.3.192.55	10.3.192.55
57	10.3.192.56/32	10.3.192.56 – 10.3.192.56	10.3.192.56
58	10.3.192.57/32	10.3.192.57 – 10.3.192.57	10.3.192.57
59	10.3.192.58/32	10.3.192.58 – 10.3.192.58	10.3.192.58
60	10.3.192.59/32	10.3.192.59 – 10.3.192.59	10.3.192.59
61	10.3.192.60/32	10.3.192.60 – 10.3.192.60	10.3.192.60
62	10.3.192.61/32	10.3.192.61 – 10.3.192.61	10.3.192.61
63	10.3.192.62/32	10.3.192.62 – 10.3.192.62	10.3.192.62
64	10.3.192.63/32	10.3.192.63 – 10.3.192.63	10.3.192.63
65	10.3.192.64/32	10.3.192.64 – 10.3.192.64	10.3.192.64
66	10.3.192.65/32	10.3.192.65 – 10.3.192.65	10.3.192.65
67	10.3.192.66/32	10.3.192.66 – 10.3.192.66	10.3.192.66
68	10.3.192.67/32	10.3.192.67 – 10.3.192.67	10.3.192.67
69	10.3.192.68/32	10.3.192.68 – 10.3.192.68	10.3.192.68
70	10.3.192.69/32	10.3.192.69 – 10.3.192.69	10.3.192.69
71	10.3.192.70/32	10.3.192.70 – 10.3.192.70	10.3.192.70
72	10.3.192.71/32	10.3.192.71 – 10.3.192.71	10.3.192.71
73	10.3.192.72/32	10.3.192.72 – 10.3.192.72	10.3.192.72
74	10.3.192.73/32	10.3.192.73 – 10.3.192.73	10.3.192.73
75	10.3.192.74/32	10.3.192.74 – 10.3.192.74	10.3.192.74
76	10.3.192.75/32	10.3.192.75 – 10.3.192.75	10.3.192.75
77	10.3.192.76/32	10.3.192.76 – 10.3.192.76	10.3.192.76
78	10.3.192.77/32	10.3.192.77 – 10.3.192.77	10.3.192.77
79	10.3.192.78/32	10.3.192.78 – 10.3.192.78	10.3.192.78
80	10.3.192.79/32	10.3.192.79 – 10.3.192.79	10.3.192.79
81	10.3.192.80/32	10.3.192.80 – 10.3.192.80	10.3.192.80
82	10.3.192.81/32	10.3.192.81 – 10.3.192.81	10.3.192.81
83	10.3.192.82/32	10.3.192.82 – 10.3.192.82	10.3.192.82
84	10.3.192.83/32	10.3.192.83 – 10.3.192.83	10.3.192.83
85	10.3.192.84/32	10.3.192.84 – 10.3.192.84	10.3.192.84
86	10.3.192.85/32	10.3.192.85 – 10.3.192.85	10.3.192.85
87	10.3.192.86/32	10.3.192.86 – 10.3.192.86	10.3.192.86
88	10.3.192.87/32	10.3.192.87 – 10.3.192.87	10.3.192.87
89	10.3.192.88/32	10.3.192.88 – 10.3.192.88	10.3.192.88
90	10.3.192.89/32	10.3.192.89 – 10.3.192.89	10.3.192.89
91	10.3.192.90/32	10.3.192.90 – 10.3.192.90	10.3.192.90
92	10.3.192.91/32	10.3.192.91 – 10.3.192.91	10.3.192.91
93	10.3.192.92/32	10.3.192.92 – 10.3.192.92	10.3.192.92
94	10.3.192.93/32	10.3.192.93 – 10.3.192.93	10.3.192.93
95	10.3.192.94/32	10.3.192.94 – 10.3.192.94	10.3.192.94
96	10.3.192.95/32	10.3.192.95 – 10.3.192.95	10.3.192.95
97	10.3.192.96/32	10.3.192.96 – 10.3.192.96	10.3.192.96
98	10.3.192.97/32	10.3.192.97 – 10.3.192.97	10.3.192.97
99	10.3.192.98/32	10.3.192.98 – 10.3.192.98	10.3.192.98
100	10.3.192.99/32	10.3.192.99 – 10.3.192.99	10.3.192.99
101	10.3.192.100/32	10.3.192.100 – 10.3.192.100	10.3.192.100
102	10.3.192.101/32	10.3.192.101 – 10.3.192.101	10.3.192.101
103	10.3.192.102/32	10.3.192.102 – 10.3.192.102	10.3.192.102
104	10.3.192.103/32	10.3.192.103 – 10.3.192.103	10.3.192.103
105	10.3.192.104/32	10.3.192.104 – 10.3.192.104	10.3.192.104
106	10.3.192.105/32	10.3.192.105 – 10.3.192.105	10.3.192.105
107	10.3.192.106/32	10.3.192.106 – 10.3.192.106	10.3.192.106
108	10.3.192.107/32	10.3.192.107 – 10.3.192.107	10.3.192.107
109	10.3.192.108/32	10.3.192.108 – 10.3.192.108	10.3.192.108
110	10.3.192.109/32	10.3.192.109 – 10.3.192.109	10.3.192.109
111	10.3.192.110/32	10.3.192.110 – 10.3.192.110	10.3.192.110
112	10.3.192.111/32	10.3.192.111 – 10.3.192.111	10.3.192.111
113	10.3.192.112/32	10.3.192.112 – 10.3.192.112	10.3.192.112
114	10.3.192.113/32	10.3.192.113 – 10.3.192.113	10.3.192.113
115	10.3.192.114/32	10.3.192.114 – 10.3.192.114	10.3.192.114
116	10.3.192.115/32	10.3.192.115 – 10.3.192.115	10.3.192.115
117	10.3.192.116/32	10.3.192.116 – 10.3.192.116	10.3.192.116
118	10.3.192.117/32	10.3.192.117 – 10.3.192.117	10.3.192.117
119	10.3.192.118/32	10.3.192.118 – 10.3.192.118	10.3.192.118
120	10.3.192.119/32	10.3.192.119 – 10.3.192.119	10.3.192.119
121	10.3.192.120/32	10.3.192.120 – 10.3.192.120	10.3.192.120
122	10.3.192.121/32	10.3.192.121 – 10.3.192.121	10.3.192.121
123	10.3.192.122/32	10.3.192.122 – 10.3.192.122	10.3.192.122
124	10.3.192.123/32	10.3.192.123 – 10.3.192.123	10.3.192.123
125	10.3.192.124/32	10.3.192.124 – 10.3.192.124	10.3.192.124
126	10.3.192.125/32	10.3.192.125 – 10.3.192.125	10.3.192.125
127	10.3.192.126/32	10.3.192.126 – 10.3.192.126	10.3.192.126
128	10.3.192.127/32	10.3.192.127 – 10.3.192.127	10.3.192.127

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 →