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)10.3.231.0/25

network10.3.231.0/25

broadcast10.3.231.127

first host10.3.231.1

last host10.3.231.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.231.0/25

address00001010.00000011.11100111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.11100111.00000000

broadcast00001010.00000011.11100111.01111111

green = network part, grey = host part

hex0x0a03e700

decimal168027904

reverse dns0.231.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:e700

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.231.0/32	10.3.231.0 – 10.3.231.0	10.3.231.0
2	10.3.231.1/32	10.3.231.1 – 10.3.231.1	10.3.231.1
3	10.3.231.2/32	10.3.231.2 – 10.3.231.2	10.3.231.2
4	10.3.231.3/32	10.3.231.3 – 10.3.231.3	10.3.231.3
5	10.3.231.4/32	10.3.231.4 – 10.3.231.4	10.3.231.4
6	10.3.231.5/32	10.3.231.5 – 10.3.231.5	10.3.231.5
7	10.3.231.6/32	10.3.231.6 – 10.3.231.6	10.3.231.6
8	10.3.231.7/32	10.3.231.7 – 10.3.231.7	10.3.231.7
9	10.3.231.8/32	10.3.231.8 – 10.3.231.8	10.3.231.8
10	10.3.231.9/32	10.3.231.9 – 10.3.231.9	10.3.231.9
11	10.3.231.10/32	10.3.231.10 – 10.3.231.10	10.3.231.10
12	10.3.231.11/32	10.3.231.11 – 10.3.231.11	10.3.231.11
13	10.3.231.12/32	10.3.231.12 – 10.3.231.12	10.3.231.12
14	10.3.231.13/32	10.3.231.13 – 10.3.231.13	10.3.231.13
15	10.3.231.14/32	10.3.231.14 – 10.3.231.14	10.3.231.14
16	10.3.231.15/32	10.3.231.15 – 10.3.231.15	10.3.231.15
17	10.3.231.16/32	10.3.231.16 – 10.3.231.16	10.3.231.16
18	10.3.231.17/32	10.3.231.17 – 10.3.231.17	10.3.231.17
19	10.3.231.18/32	10.3.231.18 – 10.3.231.18	10.3.231.18
20	10.3.231.19/32	10.3.231.19 – 10.3.231.19	10.3.231.19
21	10.3.231.20/32	10.3.231.20 – 10.3.231.20	10.3.231.20
22	10.3.231.21/32	10.3.231.21 – 10.3.231.21	10.3.231.21
23	10.3.231.22/32	10.3.231.22 – 10.3.231.22	10.3.231.22
24	10.3.231.23/32	10.3.231.23 – 10.3.231.23	10.3.231.23
25	10.3.231.24/32	10.3.231.24 – 10.3.231.24	10.3.231.24
26	10.3.231.25/32	10.3.231.25 – 10.3.231.25	10.3.231.25
27	10.3.231.26/32	10.3.231.26 – 10.3.231.26	10.3.231.26
28	10.3.231.27/32	10.3.231.27 – 10.3.231.27	10.3.231.27
29	10.3.231.28/32	10.3.231.28 – 10.3.231.28	10.3.231.28
30	10.3.231.29/32	10.3.231.29 – 10.3.231.29	10.3.231.29
31	10.3.231.30/32	10.3.231.30 – 10.3.231.30	10.3.231.30
32	10.3.231.31/32	10.3.231.31 – 10.3.231.31	10.3.231.31
33	10.3.231.32/32	10.3.231.32 – 10.3.231.32	10.3.231.32
34	10.3.231.33/32	10.3.231.33 – 10.3.231.33	10.3.231.33
35	10.3.231.34/32	10.3.231.34 – 10.3.231.34	10.3.231.34
36	10.3.231.35/32	10.3.231.35 – 10.3.231.35	10.3.231.35
37	10.3.231.36/32	10.3.231.36 – 10.3.231.36	10.3.231.36
38	10.3.231.37/32	10.3.231.37 – 10.3.231.37	10.3.231.37
39	10.3.231.38/32	10.3.231.38 – 10.3.231.38	10.3.231.38
40	10.3.231.39/32	10.3.231.39 – 10.3.231.39	10.3.231.39
41	10.3.231.40/32	10.3.231.40 – 10.3.231.40	10.3.231.40
42	10.3.231.41/32	10.3.231.41 – 10.3.231.41	10.3.231.41
43	10.3.231.42/32	10.3.231.42 – 10.3.231.42	10.3.231.42
44	10.3.231.43/32	10.3.231.43 – 10.3.231.43	10.3.231.43
45	10.3.231.44/32	10.3.231.44 – 10.3.231.44	10.3.231.44
46	10.3.231.45/32	10.3.231.45 – 10.3.231.45	10.3.231.45
47	10.3.231.46/32	10.3.231.46 – 10.3.231.46	10.3.231.46
48	10.3.231.47/32	10.3.231.47 – 10.3.231.47	10.3.231.47
49	10.3.231.48/32	10.3.231.48 – 10.3.231.48	10.3.231.48
50	10.3.231.49/32	10.3.231.49 – 10.3.231.49	10.3.231.49
51	10.3.231.50/32	10.3.231.50 – 10.3.231.50	10.3.231.50
52	10.3.231.51/32	10.3.231.51 – 10.3.231.51	10.3.231.51
53	10.3.231.52/32	10.3.231.52 – 10.3.231.52	10.3.231.52
54	10.3.231.53/32	10.3.231.53 – 10.3.231.53	10.3.231.53
55	10.3.231.54/32	10.3.231.54 – 10.3.231.54	10.3.231.54
56	10.3.231.55/32	10.3.231.55 – 10.3.231.55	10.3.231.55
57	10.3.231.56/32	10.3.231.56 – 10.3.231.56	10.3.231.56
58	10.3.231.57/32	10.3.231.57 – 10.3.231.57	10.3.231.57
59	10.3.231.58/32	10.3.231.58 – 10.3.231.58	10.3.231.58
60	10.3.231.59/32	10.3.231.59 – 10.3.231.59	10.3.231.59
61	10.3.231.60/32	10.3.231.60 – 10.3.231.60	10.3.231.60
62	10.3.231.61/32	10.3.231.61 – 10.3.231.61	10.3.231.61
63	10.3.231.62/32	10.3.231.62 – 10.3.231.62	10.3.231.62
64	10.3.231.63/32	10.3.231.63 – 10.3.231.63	10.3.231.63
65	10.3.231.64/32	10.3.231.64 – 10.3.231.64	10.3.231.64
66	10.3.231.65/32	10.3.231.65 – 10.3.231.65	10.3.231.65
67	10.3.231.66/32	10.3.231.66 – 10.3.231.66	10.3.231.66
68	10.3.231.67/32	10.3.231.67 – 10.3.231.67	10.3.231.67
69	10.3.231.68/32	10.3.231.68 – 10.3.231.68	10.3.231.68
70	10.3.231.69/32	10.3.231.69 – 10.3.231.69	10.3.231.69
71	10.3.231.70/32	10.3.231.70 – 10.3.231.70	10.3.231.70
72	10.3.231.71/32	10.3.231.71 – 10.3.231.71	10.3.231.71
73	10.3.231.72/32	10.3.231.72 – 10.3.231.72	10.3.231.72
74	10.3.231.73/32	10.3.231.73 – 10.3.231.73	10.3.231.73
75	10.3.231.74/32	10.3.231.74 – 10.3.231.74	10.3.231.74
76	10.3.231.75/32	10.3.231.75 – 10.3.231.75	10.3.231.75
77	10.3.231.76/32	10.3.231.76 – 10.3.231.76	10.3.231.76
78	10.3.231.77/32	10.3.231.77 – 10.3.231.77	10.3.231.77
79	10.3.231.78/32	10.3.231.78 – 10.3.231.78	10.3.231.78
80	10.3.231.79/32	10.3.231.79 – 10.3.231.79	10.3.231.79
81	10.3.231.80/32	10.3.231.80 – 10.3.231.80	10.3.231.80
82	10.3.231.81/32	10.3.231.81 – 10.3.231.81	10.3.231.81
83	10.3.231.82/32	10.3.231.82 – 10.3.231.82	10.3.231.82
84	10.3.231.83/32	10.3.231.83 – 10.3.231.83	10.3.231.83
85	10.3.231.84/32	10.3.231.84 – 10.3.231.84	10.3.231.84
86	10.3.231.85/32	10.3.231.85 – 10.3.231.85	10.3.231.85
87	10.3.231.86/32	10.3.231.86 – 10.3.231.86	10.3.231.86
88	10.3.231.87/32	10.3.231.87 – 10.3.231.87	10.3.231.87
89	10.3.231.88/32	10.3.231.88 – 10.3.231.88	10.3.231.88
90	10.3.231.89/32	10.3.231.89 – 10.3.231.89	10.3.231.89
91	10.3.231.90/32	10.3.231.90 – 10.3.231.90	10.3.231.90
92	10.3.231.91/32	10.3.231.91 – 10.3.231.91	10.3.231.91
93	10.3.231.92/32	10.3.231.92 – 10.3.231.92	10.3.231.92
94	10.3.231.93/32	10.3.231.93 – 10.3.231.93	10.3.231.93
95	10.3.231.94/32	10.3.231.94 – 10.3.231.94	10.3.231.94
96	10.3.231.95/32	10.3.231.95 – 10.3.231.95	10.3.231.95
97	10.3.231.96/32	10.3.231.96 – 10.3.231.96	10.3.231.96
98	10.3.231.97/32	10.3.231.97 – 10.3.231.97	10.3.231.97
99	10.3.231.98/32	10.3.231.98 – 10.3.231.98	10.3.231.98
100	10.3.231.99/32	10.3.231.99 – 10.3.231.99	10.3.231.99
101	10.3.231.100/32	10.3.231.100 – 10.3.231.100	10.3.231.100
102	10.3.231.101/32	10.3.231.101 – 10.3.231.101	10.3.231.101
103	10.3.231.102/32	10.3.231.102 – 10.3.231.102	10.3.231.102
104	10.3.231.103/32	10.3.231.103 – 10.3.231.103	10.3.231.103
105	10.3.231.104/32	10.3.231.104 – 10.3.231.104	10.3.231.104
106	10.3.231.105/32	10.3.231.105 – 10.3.231.105	10.3.231.105
107	10.3.231.106/32	10.3.231.106 – 10.3.231.106	10.3.231.106
108	10.3.231.107/32	10.3.231.107 – 10.3.231.107	10.3.231.107
109	10.3.231.108/32	10.3.231.108 – 10.3.231.108	10.3.231.108
110	10.3.231.109/32	10.3.231.109 – 10.3.231.109	10.3.231.109
111	10.3.231.110/32	10.3.231.110 – 10.3.231.110	10.3.231.110
112	10.3.231.111/32	10.3.231.111 – 10.3.231.111	10.3.231.111
113	10.3.231.112/32	10.3.231.112 – 10.3.231.112	10.3.231.112
114	10.3.231.113/32	10.3.231.113 – 10.3.231.113	10.3.231.113
115	10.3.231.114/32	10.3.231.114 – 10.3.231.114	10.3.231.114
116	10.3.231.115/32	10.3.231.115 – 10.3.231.115	10.3.231.115
117	10.3.231.116/32	10.3.231.116 – 10.3.231.116	10.3.231.116
118	10.3.231.117/32	10.3.231.117 – 10.3.231.117	10.3.231.117
119	10.3.231.118/32	10.3.231.118 – 10.3.231.118	10.3.231.118
120	10.3.231.119/32	10.3.231.119 – 10.3.231.119	10.3.231.119
121	10.3.231.120/32	10.3.231.120 – 10.3.231.120	10.3.231.120
122	10.3.231.121/32	10.3.231.121 – 10.3.231.121	10.3.231.121
123	10.3.231.122/32	10.3.231.122 – 10.3.231.122	10.3.231.122
124	10.3.231.123/32	10.3.231.123 – 10.3.231.123	10.3.231.123
125	10.3.231.124/32	10.3.231.124 – 10.3.231.124	10.3.231.124
126	10.3.231.125/32	10.3.231.125 – 10.3.231.125	10.3.231.125
127	10.3.231.126/32	10.3.231.126 – 10.3.231.126	10.3.231.126
128	10.3.231.127/32	10.3.231.127 – 10.3.231.127	10.3.231.127

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 →