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)10.3.102.0/25

network10.3.102.0/25

broadcast10.3.102.127

first host10.3.102.1

last host10.3.102.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.102.0/25

address00001010.00000011.01100110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.01100110.00000000

broadcast00001010.00000011.01100110.01111111

green = network part, grey = host part

hex0x0a036600

decimal167994880

reverse dns0.102.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:6600

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.102.0/32	10.3.102.0 – 10.3.102.0	10.3.102.0
2	10.3.102.1/32	10.3.102.1 – 10.3.102.1	10.3.102.1
3	10.3.102.2/32	10.3.102.2 – 10.3.102.2	10.3.102.2
4	10.3.102.3/32	10.3.102.3 – 10.3.102.3	10.3.102.3
5	10.3.102.4/32	10.3.102.4 – 10.3.102.4	10.3.102.4
6	10.3.102.5/32	10.3.102.5 – 10.3.102.5	10.3.102.5
7	10.3.102.6/32	10.3.102.6 – 10.3.102.6	10.3.102.6
8	10.3.102.7/32	10.3.102.7 – 10.3.102.7	10.3.102.7
9	10.3.102.8/32	10.3.102.8 – 10.3.102.8	10.3.102.8
10	10.3.102.9/32	10.3.102.9 – 10.3.102.9	10.3.102.9
11	10.3.102.10/32	10.3.102.10 – 10.3.102.10	10.3.102.10
12	10.3.102.11/32	10.3.102.11 – 10.3.102.11	10.3.102.11
13	10.3.102.12/32	10.3.102.12 – 10.3.102.12	10.3.102.12
14	10.3.102.13/32	10.3.102.13 – 10.3.102.13	10.3.102.13
15	10.3.102.14/32	10.3.102.14 – 10.3.102.14	10.3.102.14
16	10.3.102.15/32	10.3.102.15 – 10.3.102.15	10.3.102.15
17	10.3.102.16/32	10.3.102.16 – 10.3.102.16	10.3.102.16
18	10.3.102.17/32	10.3.102.17 – 10.3.102.17	10.3.102.17
19	10.3.102.18/32	10.3.102.18 – 10.3.102.18	10.3.102.18
20	10.3.102.19/32	10.3.102.19 – 10.3.102.19	10.3.102.19
21	10.3.102.20/32	10.3.102.20 – 10.3.102.20	10.3.102.20
22	10.3.102.21/32	10.3.102.21 – 10.3.102.21	10.3.102.21
23	10.3.102.22/32	10.3.102.22 – 10.3.102.22	10.3.102.22
24	10.3.102.23/32	10.3.102.23 – 10.3.102.23	10.3.102.23
25	10.3.102.24/32	10.3.102.24 – 10.3.102.24	10.3.102.24
26	10.3.102.25/32	10.3.102.25 – 10.3.102.25	10.3.102.25
27	10.3.102.26/32	10.3.102.26 – 10.3.102.26	10.3.102.26
28	10.3.102.27/32	10.3.102.27 – 10.3.102.27	10.3.102.27
29	10.3.102.28/32	10.3.102.28 – 10.3.102.28	10.3.102.28
30	10.3.102.29/32	10.3.102.29 – 10.3.102.29	10.3.102.29
31	10.3.102.30/32	10.3.102.30 – 10.3.102.30	10.3.102.30
32	10.3.102.31/32	10.3.102.31 – 10.3.102.31	10.3.102.31
33	10.3.102.32/32	10.3.102.32 – 10.3.102.32	10.3.102.32
34	10.3.102.33/32	10.3.102.33 – 10.3.102.33	10.3.102.33
35	10.3.102.34/32	10.3.102.34 – 10.3.102.34	10.3.102.34
36	10.3.102.35/32	10.3.102.35 – 10.3.102.35	10.3.102.35
37	10.3.102.36/32	10.3.102.36 – 10.3.102.36	10.3.102.36
38	10.3.102.37/32	10.3.102.37 – 10.3.102.37	10.3.102.37
39	10.3.102.38/32	10.3.102.38 – 10.3.102.38	10.3.102.38
40	10.3.102.39/32	10.3.102.39 – 10.3.102.39	10.3.102.39
41	10.3.102.40/32	10.3.102.40 – 10.3.102.40	10.3.102.40
42	10.3.102.41/32	10.3.102.41 – 10.3.102.41	10.3.102.41
43	10.3.102.42/32	10.3.102.42 – 10.3.102.42	10.3.102.42
44	10.3.102.43/32	10.3.102.43 – 10.3.102.43	10.3.102.43
45	10.3.102.44/32	10.3.102.44 – 10.3.102.44	10.3.102.44
46	10.3.102.45/32	10.3.102.45 – 10.3.102.45	10.3.102.45
47	10.3.102.46/32	10.3.102.46 – 10.3.102.46	10.3.102.46
48	10.3.102.47/32	10.3.102.47 – 10.3.102.47	10.3.102.47
49	10.3.102.48/32	10.3.102.48 – 10.3.102.48	10.3.102.48
50	10.3.102.49/32	10.3.102.49 – 10.3.102.49	10.3.102.49
51	10.3.102.50/32	10.3.102.50 – 10.3.102.50	10.3.102.50
52	10.3.102.51/32	10.3.102.51 – 10.3.102.51	10.3.102.51
53	10.3.102.52/32	10.3.102.52 – 10.3.102.52	10.3.102.52
54	10.3.102.53/32	10.3.102.53 – 10.3.102.53	10.3.102.53
55	10.3.102.54/32	10.3.102.54 – 10.3.102.54	10.3.102.54
56	10.3.102.55/32	10.3.102.55 – 10.3.102.55	10.3.102.55
57	10.3.102.56/32	10.3.102.56 – 10.3.102.56	10.3.102.56
58	10.3.102.57/32	10.3.102.57 – 10.3.102.57	10.3.102.57
59	10.3.102.58/32	10.3.102.58 – 10.3.102.58	10.3.102.58
60	10.3.102.59/32	10.3.102.59 – 10.3.102.59	10.3.102.59
61	10.3.102.60/32	10.3.102.60 – 10.3.102.60	10.3.102.60
62	10.3.102.61/32	10.3.102.61 – 10.3.102.61	10.3.102.61
63	10.3.102.62/32	10.3.102.62 – 10.3.102.62	10.3.102.62
64	10.3.102.63/32	10.3.102.63 – 10.3.102.63	10.3.102.63
65	10.3.102.64/32	10.3.102.64 – 10.3.102.64	10.3.102.64
66	10.3.102.65/32	10.3.102.65 – 10.3.102.65	10.3.102.65
67	10.3.102.66/32	10.3.102.66 – 10.3.102.66	10.3.102.66
68	10.3.102.67/32	10.3.102.67 – 10.3.102.67	10.3.102.67
69	10.3.102.68/32	10.3.102.68 – 10.3.102.68	10.3.102.68
70	10.3.102.69/32	10.3.102.69 – 10.3.102.69	10.3.102.69
71	10.3.102.70/32	10.3.102.70 – 10.3.102.70	10.3.102.70
72	10.3.102.71/32	10.3.102.71 – 10.3.102.71	10.3.102.71
73	10.3.102.72/32	10.3.102.72 – 10.3.102.72	10.3.102.72
74	10.3.102.73/32	10.3.102.73 – 10.3.102.73	10.3.102.73
75	10.3.102.74/32	10.3.102.74 – 10.3.102.74	10.3.102.74
76	10.3.102.75/32	10.3.102.75 – 10.3.102.75	10.3.102.75
77	10.3.102.76/32	10.3.102.76 – 10.3.102.76	10.3.102.76
78	10.3.102.77/32	10.3.102.77 – 10.3.102.77	10.3.102.77
79	10.3.102.78/32	10.3.102.78 – 10.3.102.78	10.3.102.78
80	10.3.102.79/32	10.3.102.79 – 10.3.102.79	10.3.102.79
81	10.3.102.80/32	10.3.102.80 – 10.3.102.80	10.3.102.80
82	10.3.102.81/32	10.3.102.81 – 10.3.102.81	10.3.102.81
83	10.3.102.82/32	10.3.102.82 – 10.3.102.82	10.3.102.82
84	10.3.102.83/32	10.3.102.83 – 10.3.102.83	10.3.102.83
85	10.3.102.84/32	10.3.102.84 – 10.3.102.84	10.3.102.84
86	10.3.102.85/32	10.3.102.85 – 10.3.102.85	10.3.102.85
87	10.3.102.86/32	10.3.102.86 – 10.3.102.86	10.3.102.86
88	10.3.102.87/32	10.3.102.87 – 10.3.102.87	10.3.102.87
89	10.3.102.88/32	10.3.102.88 – 10.3.102.88	10.3.102.88
90	10.3.102.89/32	10.3.102.89 – 10.3.102.89	10.3.102.89
91	10.3.102.90/32	10.3.102.90 – 10.3.102.90	10.3.102.90
92	10.3.102.91/32	10.3.102.91 – 10.3.102.91	10.3.102.91
93	10.3.102.92/32	10.3.102.92 – 10.3.102.92	10.3.102.92
94	10.3.102.93/32	10.3.102.93 – 10.3.102.93	10.3.102.93
95	10.3.102.94/32	10.3.102.94 – 10.3.102.94	10.3.102.94
96	10.3.102.95/32	10.3.102.95 – 10.3.102.95	10.3.102.95
97	10.3.102.96/32	10.3.102.96 – 10.3.102.96	10.3.102.96
98	10.3.102.97/32	10.3.102.97 – 10.3.102.97	10.3.102.97
99	10.3.102.98/32	10.3.102.98 – 10.3.102.98	10.3.102.98
100	10.3.102.99/32	10.3.102.99 – 10.3.102.99	10.3.102.99
101	10.3.102.100/32	10.3.102.100 – 10.3.102.100	10.3.102.100
102	10.3.102.101/32	10.3.102.101 – 10.3.102.101	10.3.102.101
103	10.3.102.102/32	10.3.102.102 – 10.3.102.102	10.3.102.102
104	10.3.102.103/32	10.3.102.103 – 10.3.102.103	10.3.102.103
105	10.3.102.104/32	10.3.102.104 – 10.3.102.104	10.3.102.104
106	10.3.102.105/32	10.3.102.105 – 10.3.102.105	10.3.102.105
107	10.3.102.106/32	10.3.102.106 – 10.3.102.106	10.3.102.106
108	10.3.102.107/32	10.3.102.107 – 10.3.102.107	10.3.102.107
109	10.3.102.108/32	10.3.102.108 – 10.3.102.108	10.3.102.108
110	10.3.102.109/32	10.3.102.109 – 10.3.102.109	10.3.102.109
111	10.3.102.110/32	10.3.102.110 – 10.3.102.110	10.3.102.110
112	10.3.102.111/32	10.3.102.111 – 10.3.102.111	10.3.102.111
113	10.3.102.112/32	10.3.102.112 – 10.3.102.112	10.3.102.112
114	10.3.102.113/32	10.3.102.113 – 10.3.102.113	10.3.102.113
115	10.3.102.114/32	10.3.102.114 – 10.3.102.114	10.3.102.114
116	10.3.102.115/32	10.3.102.115 – 10.3.102.115	10.3.102.115
117	10.3.102.116/32	10.3.102.116 – 10.3.102.116	10.3.102.116
118	10.3.102.117/32	10.3.102.117 – 10.3.102.117	10.3.102.117
119	10.3.102.118/32	10.3.102.118 – 10.3.102.118	10.3.102.118
120	10.3.102.119/32	10.3.102.119 – 10.3.102.119	10.3.102.119
121	10.3.102.120/32	10.3.102.120 – 10.3.102.120	10.3.102.120
122	10.3.102.121/32	10.3.102.121 – 10.3.102.121	10.3.102.121
123	10.3.102.122/32	10.3.102.122 – 10.3.102.122	10.3.102.122
124	10.3.102.123/32	10.3.102.123 – 10.3.102.123	10.3.102.123
125	10.3.102.124/32	10.3.102.124 – 10.3.102.124	10.3.102.124
126	10.3.102.125/32	10.3.102.125 – 10.3.102.125	10.3.102.125
127	10.3.102.126/32	10.3.102.126 – 10.3.102.126	10.3.102.126
128	10.3.102.127/32	10.3.102.127 – 10.3.102.127	10.3.102.127

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 →