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)10.2.183.0/25

network10.2.183.0/25

broadcast10.2.183.127

first host10.2.183.1

last host10.2.183.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.183.0/25

address00001010.00000010.10110111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.10110111.00000000

broadcast00001010.00000010.10110111.01111111

green = network part, grey = host part

hex0x0a02b700

decimal167950080

reverse dns0.183.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:b700

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.183.0/32	10.2.183.0 – 10.2.183.0	10.2.183.0
2	10.2.183.1/32	10.2.183.1 – 10.2.183.1	10.2.183.1
3	10.2.183.2/32	10.2.183.2 – 10.2.183.2	10.2.183.2
4	10.2.183.3/32	10.2.183.3 – 10.2.183.3	10.2.183.3
5	10.2.183.4/32	10.2.183.4 – 10.2.183.4	10.2.183.4
6	10.2.183.5/32	10.2.183.5 – 10.2.183.5	10.2.183.5
7	10.2.183.6/32	10.2.183.6 – 10.2.183.6	10.2.183.6
8	10.2.183.7/32	10.2.183.7 – 10.2.183.7	10.2.183.7
9	10.2.183.8/32	10.2.183.8 – 10.2.183.8	10.2.183.8
10	10.2.183.9/32	10.2.183.9 – 10.2.183.9	10.2.183.9
11	10.2.183.10/32	10.2.183.10 – 10.2.183.10	10.2.183.10
12	10.2.183.11/32	10.2.183.11 – 10.2.183.11	10.2.183.11
13	10.2.183.12/32	10.2.183.12 – 10.2.183.12	10.2.183.12
14	10.2.183.13/32	10.2.183.13 – 10.2.183.13	10.2.183.13
15	10.2.183.14/32	10.2.183.14 – 10.2.183.14	10.2.183.14
16	10.2.183.15/32	10.2.183.15 – 10.2.183.15	10.2.183.15
17	10.2.183.16/32	10.2.183.16 – 10.2.183.16	10.2.183.16
18	10.2.183.17/32	10.2.183.17 – 10.2.183.17	10.2.183.17
19	10.2.183.18/32	10.2.183.18 – 10.2.183.18	10.2.183.18
20	10.2.183.19/32	10.2.183.19 – 10.2.183.19	10.2.183.19
21	10.2.183.20/32	10.2.183.20 – 10.2.183.20	10.2.183.20
22	10.2.183.21/32	10.2.183.21 – 10.2.183.21	10.2.183.21
23	10.2.183.22/32	10.2.183.22 – 10.2.183.22	10.2.183.22
24	10.2.183.23/32	10.2.183.23 – 10.2.183.23	10.2.183.23
25	10.2.183.24/32	10.2.183.24 – 10.2.183.24	10.2.183.24
26	10.2.183.25/32	10.2.183.25 – 10.2.183.25	10.2.183.25
27	10.2.183.26/32	10.2.183.26 – 10.2.183.26	10.2.183.26
28	10.2.183.27/32	10.2.183.27 – 10.2.183.27	10.2.183.27
29	10.2.183.28/32	10.2.183.28 – 10.2.183.28	10.2.183.28
30	10.2.183.29/32	10.2.183.29 – 10.2.183.29	10.2.183.29
31	10.2.183.30/32	10.2.183.30 – 10.2.183.30	10.2.183.30
32	10.2.183.31/32	10.2.183.31 – 10.2.183.31	10.2.183.31
33	10.2.183.32/32	10.2.183.32 – 10.2.183.32	10.2.183.32
34	10.2.183.33/32	10.2.183.33 – 10.2.183.33	10.2.183.33
35	10.2.183.34/32	10.2.183.34 – 10.2.183.34	10.2.183.34
36	10.2.183.35/32	10.2.183.35 – 10.2.183.35	10.2.183.35
37	10.2.183.36/32	10.2.183.36 – 10.2.183.36	10.2.183.36
38	10.2.183.37/32	10.2.183.37 – 10.2.183.37	10.2.183.37
39	10.2.183.38/32	10.2.183.38 – 10.2.183.38	10.2.183.38
40	10.2.183.39/32	10.2.183.39 – 10.2.183.39	10.2.183.39
41	10.2.183.40/32	10.2.183.40 – 10.2.183.40	10.2.183.40
42	10.2.183.41/32	10.2.183.41 – 10.2.183.41	10.2.183.41
43	10.2.183.42/32	10.2.183.42 – 10.2.183.42	10.2.183.42
44	10.2.183.43/32	10.2.183.43 – 10.2.183.43	10.2.183.43
45	10.2.183.44/32	10.2.183.44 – 10.2.183.44	10.2.183.44
46	10.2.183.45/32	10.2.183.45 – 10.2.183.45	10.2.183.45
47	10.2.183.46/32	10.2.183.46 – 10.2.183.46	10.2.183.46
48	10.2.183.47/32	10.2.183.47 – 10.2.183.47	10.2.183.47
49	10.2.183.48/32	10.2.183.48 – 10.2.183.48	10.2.183.48
50	10.2.183.49/32	10.2.183.49 – 10.2.183.49	10.2.183.49
51	10.2.183.50/32	10.2.183.50 – 10.2.183.50	10.2.183.50
52	10.2.183.51/32	10.2.183.51 – 10.2.183.51	10.2.183.51
53	10.2.183.52/32	10.2.183.52 – 10.2.183.52	10.2.183.52
54	10.2.183.53/32	10.2.183.53 – 10.2.183.53	10.2.183.53
55	10.2.183.54/32	10.2.183.54 – 10.2.183.54	10.2.183.54
56	10.2.183.55/32	10.2.183.55 – 10.2.183.55	10.2.183.55
57	10.2.183.56/32	10.2.183.56 – 10.2.183.56	10.2.183.56
58	10.2.183.57/32	10.2.183.57 – 10.2.183.57	10.2.183.57
59	10.2.183.58/32	10.2.183.58 – 10.2.183.58	10.2.183.58
60	10.2.183.59/32	10.2.183.59 – 10.2.183.59	10.2.183.59
61	10.2.183.60/32	10.2.183.60 – 10.2.183.60	10.2.183.60
62	10.2.183.61/32	10.2.183.61 – 10.2.183.61	10.2.183.61
63	10.2.183.62/32	10.2.183.62 – 10.2.183.62	10.2.183.62
64	10.2.183.63/32	10.2.183.63 – 10.2.183.63	10.2.183.63
65	10.2.183.64/32	10.2.183.64 – 10.2.183.64	10.2.183.64
66	10.2.183.65/32	10.2.183.65 – 10.2.183.65	10.2.183.65
67	10.2.183.66/32	10.2.183.66 – 10.2.183.66	10.2.183.66
68	10.2.183.67/32	10.2.183.67 – 10.2.183.67	10.2.183.67
69	10.2.183.68/32	10.2.183.68 – 10.2.183.68	10.2.183.68
70	10.2.183.69/32	10.2.183.69 – 10.2.183.69	10.2.183.69
71	10.2.183.70/32	10.2.183.70 – 10.2.183.70	10.2.183.70
72	10.2.183.71/32	10.2.183.71 – 10.2.183.71	10.2.183.71
73	10.2.183.72/32	10.2.183.72 – 10.2.183.72	10.2.183.72
74	10.2.183.73/32	10.2.183.73 – 10.2.183.73	10.2.183.73
75	10.2.183.74/32	10.2.183.74 – 10.2.183.74	10.2.183.74
76	10.2.183.75/32	10.2.183.75 – 10.2.183.75	10.2.183.75
77	10.2.183.76/32	10.2.183.76 – 10.2.183.76	10.2.183.76
78	10.2.183.77/32	10.2.183.77 – 10.2.183.77	10.2.183.77
79	10.2.183.78/32	10.2.183.78 – 10.2.183.78	10.2.183.78
80	10.2.183.79/32	10.2.183.79 – 10.2.183.79	10.2.183.79
81	10.2.183.80/32	10.2.183.80 – 10.2.183.80	10.2.183.80
82	10.2.183.81/32	10.2.183.81 – 10.2.183.81	10.2.183.81
83	10.2.183.82/32	10.2.183.82 – 10.2.183.82	10.2.183.82
84	10.2.183.83/32	10.2.183.83 – 10.2.183.83	10.2.183.83
85	10.2.183.84/32	10.2.183.84 – 10.2.183.84	10.2.183.84
86	10.2.183.85/32	10.2.183.85 – 10.2.183.85	10.2.183.85
87	10.2.183.86/32	10.2.183.86 – 10.2.183.86	10.2.183.86
88	10.2.183.87/32	10.2.183.87 – 10.2.183.87	10.2.183.87
89	10.2.183.88/32	10.2.183.88 – 10.2.183.88	10.2.183.88
90	10.2.183.89/32	10.2.183.89 – 10.2.183.89	10.2.183.89
91	10.2.183.90/32	10.2.183.90 – 10.2.183.90	10.2.183.90
92	10.2.183.91/32	10.2.183.91 – 10.2.183.91	10.2.183.91
93	10.2.183.92/32	10.2.183.92 – 10.2.183.92	10.2.183.92
94	10.2.183.93/32	10.2.183.93 – 10.2.183.93	10.2.183.93
95	10.2.183.94/32	10.2.183.94 – 10.2.183.94	10.2.183.94
96	10.2.183.95/32	10.2.183.95 – 10.2.183.95	10.2.183.95
97	10.2.183.96/32	10.2.183.96 – 10.2.183.96	10.2.183.96
98	10.2.183.97/32	10.2.183.97 – 10.2.183.97	10.2.183.97
99	10.2.183.98/32	10.2.183.98 – 10.2.183.98	10.2.183.98
100	10.2.183.99/32	10.2.183.99 – 10.2.183.99	10.2.183.99
101	10.2.183.100/32	10.2.183.100 – 10.2.183.100	10.2.183.100
102	10.2.183.101/32	10.2.183.101 – 10.2.183.101	10.2.183.101
103	10.2.183.102/32	10.2.183.102 – 10.2.183.102	10.2.183.102
104	10.2.183.103/32	10.2.183.103 – 10.2.183.103	10.2.183.103
105	10.2.183.104/32	10.2.183.104 – 10.2.183.104	10.2.183.104
106	10.2.183.105/32	10.2.183.105 – 10.2.183.105	10.2.183.105
107	10.2.183.106/32	10.2.183.106 – 10.2.183.106	10.2.183.106
108	10.2.183.107/32	10.2.183.107 – 10.2.183.107	10.2.183.107
109	10.2.183.108/32	10.2.183.108 – 10.2.183.108	10.2.183.108
110	10.2.183.109/32	10.2.183.109 – 10.2.183.109	10.2.183.109
111	10.2.183.110/32	10.2.183.110 – 10.2.183.110	10.2.183.110
112	10.2.183.111/32	10.2.183.111 – 10.2.183.111	10.2.183.111
113	10.2.183.112/32	10.2.183.112 – 10.2.183.112	10.2.183.112
114	10.2.183.113/32	10.2.183.113 – 10.2.183.113	10.2.183.113
115	10.2.183.114/32	10.2.183.114 – 10.2.183.114	10.2.183.114
116	10.2.183.115/32	10.2.183.115 – 10.2.183.115	10.2.183.115
117	10.2.183.116/32	10.2.183.116 – 10.2.183.116	10.2.183.116
118	10.2.183.117/32	10.2.183.117 – 10.2.183.117	10.2.183.117
119	10.2.183.118/32	10.2.183.118 – 10.2.183.118	10.2.183.118
120	10.2.183.119/32	10.2.183.119 – 10.2.183.119	10.2.183.119
121	10.2.183.120/32	10.2.183.120 – 10.2.183.120	10.2.183.120
122	10.2.183.121/32	10.2.183.121 – 10.2.183.121	10.2.183.121
123	10.2.183.122/32	10.2.183.122 – 10.2.183.122	10.2.183.122
124	10.2.183.123/32	10.2.183.123 – 10.2.183.123	10.2.183.123
125	10.2.183.124/32	10.2.183.124 – 10.2.183.124	10.2.183.124
126	10.2.183.125/32	10.2.183.125 – 10.2.183.125	10.2.183.125
127	10.2.183.126/32	10.2.183.126 – 10.2.183.126	10.2.183.126
128	10.2.183.127/32	10.2.183.127 – 10.2.183.127	10.2.183.127

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 →