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)10.158.2.0/25

network10.158.2.0/25

broadcast10.158.2.127

first host10.158.2.1

last host10.158.2.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.158.2.0/25

address00001010.10011110.00000010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10011110.00000010.00000000

broadcast00001010.10011110.00000010.01111111

green = network part, grey = host part

hex0x0a9e0200

decimal178127360

reverse dns0.2.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:200

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.2.0/32	10.158.2.0 – 10.158.2.0	10.158.2.0
2	10.158.2.1/32	10.158.2.1 – 10.158.2.1	10.158.2.1
3	10.158.2.2/32	10.158.2.2 – 10.158.2.2	10.158.2.2
4	10.158.2.3/32	10.158.2.3 – 10.158.2.3	10.158.2.3
5	10.158.2.4/32	10.158.2.4 – 10.158.2.4	10.158.2.4
6	10.158.2.5/32	10.158.2.5 – 10.158.2.5	10.158.2.5
7	10.158.2.6/32	10.158.2.6 – 10.158.2.6	10.158.2.6
8	10.158.2.7/32	10.158.2.7 – 10.158.2.7	10.158.2.7
9	10.158.2.8/32	10.158.2.8 – 10.158.2.8	10.158.2.8
10	10.158.2.9/32	10.158.2.9 – 10.158.2.9	10.158.2.9
11	10.158.2.10/32	10.158.2.10 – 10.158.2.10	10.158.2.10
12	10.158.2.11/32	10.158.2.11 – 10.158.2.11	10.158.2.11
13	10.158.2.12/32	10.158.2.12 – 10.158.2.12	10.158.2.12
14	10.158.2.13/32	10.158.2.13 – 10.158.2.13	10.158.2.13
15	10.158.2.14/32	10.158.2.14 – 10.158.2.14	10.158.2.14
16	10.158.2.15/32	10.158.2.15 – 10.158.2.15	10.158.2.15
17	10.158.2.16/32	10.158.2.16 – 10.158.2.16	10.158.2.16
18	10.158.2.17/32	10.158.2.17 – 10.158.2.17	10.158.2.17
19	10.158.2.18/32	10.158.2.18 – 10.158.2.18	10.158.2.18
20	10.158.2.19/32	10.158.2.19 – 10.158.2.19	10.158.2.19
21	10.158.2.20/32	10.158.2.20 – 10.158.2.20	10.158.2.20
22	10.158.2.21/32	10.158.2.21 – 10.158.2.21	10.158.2.21
23	10.158.2.22/32	10.158.2.22 – 10.158.2.22	10.158.2.22
24	10.158.2.23/32	10.158.2.23 – 10.158.2.23	10.158.2.23
25	10.158.2.24/32	10.158.2.24 – 10.158.2.24	10.158.2.24
26	10.158.2.25/32	10.158.2.25 – 10.158.2.25	10.158.2.25
27	10.158.2.26/32	10.158.2.26 – 10.158.2.26	10.158.2.26
28	10.158.2.27/32	10.158.2.27 – 10.158.2.27	10.158.2.27
29	10.158.2.28/32	10.158.2.28 – 10.158.2.28	10.158.2.28
30	10.158.2.29/32	10.158.2.29 – 10.158.2.29	10.158.2.29
31	10.158.2.30/32	10.158.2.30 – 10.158.2.30	10.158.2.30
32	10.158.2.31/32	10.158.2.31 – 10.158.2.31	10.158.2.31
33	10.158.2.32/32	10.158.2.32 – 10.158.2.32	10.158.2.32
34	10.158.2.33/32	10.158.2.33 – 10.158.2.33	10.158.2.33
35	10.158.2.34/32	10.158.2.34 – 10.158.2.34	10.158.2.34
36	10.158.2.35/32	10.158.2.35 – 10.158.2.35	10.158.2.35
37	10.158.2.36/32	10.158.2.36 – 10.158.2.36	10.158.2.36
38	10.158.2.37/32	10.158.2.37 – 10.158.2.37	10.158.2.37
39	10.158.2.38/32	10.158.2.38 – 10.158.2.38	10.158.2.38
40	10.158.2.39/32	10.158.2.39 – 10.158.2.39	10.158.2.39
41	10.158.2.40/32	10.158.2.40 – 10.158.2.40	10.158.2.40
42	10.158.2.41/32	10.158.2.41 – 10.158.2.41	10.158.2.41
43	10.158.2.42/32	10.158.2.42 – 10.158.2.42	10.158.2.42
44	10.158.2.43/32	10.158.2.43 – 10.158.2.43	10.158.2.43
45	10.158.2.44/32	10.158.2.44 – 10.158.2.44	10.158.2.44
46	10.158.2.45/32	10.158.2.45 – 10.158.2.45	10.158.2.45
47	10.158.2.46/32	10.158.2.46 – 10.158.2.46	10.158.2.46
48	10.158.2.47/32	10.158.2.47 – 10.158.2.47	10.158.2.47
49	10.158.2.48/32	10.158.2.48 – 10.158.2.48	10.158.2.48
50	10.158.2.49/32	10.158.2.49 – 10.158.2.49	10.158.2.49
51	10.158.2.50/32	10.158.2.50 – 10.158.2.50	10.158.2.50
52	10.158.2.51/32	10.158.2.51 – 10.158.2.51	10.158.2.51
53	10.158.2.52/32	10.158.2.52 – 10.158.2.52	10.158.2.52
54	10.158.2.53/32	10.158.2.53 – 10.158.2.53	10.158.2.53
55	10.158.2.54/32	10.158.2.54 – 10.158.2.54	10.158.2.54
56	10.158.2.55/32	10.158.2.55 – 10.158.2.55	10.158.2.55
57	10.158.2.56/32	10.158.2.56 – 10.158.2.56	10.158.2.56
58	10.158.2.57/32	10.158.2.57 – 10.158.2.57	10.158.2.57
59	10.158.2.58/32	10.158.2.58 – 10.158.2.58	10.158.2.58
60	10.158.2.59/32	10.158.2.59 – 10.158.2.59	10.158.2.59
61	10.158.2.60/32	10.158.2.60 – 10.158.2.60	10.158.2.60
62	10.158.2.61/32	10.158.2.61 – 10.158.2.61	10.158.2.61
63	10.158.2.62/32	10.158.2.62 – 10.158.2.62	10.158.2.62
64	10.158.2.63/32	10.158.2.63 – 10.158.2.63	10.158.2.63
65	10.158.2.64/32	10.158.2.64 – 10.158.2.64	10.158.2.64
66	10.158.2.65/32	10.158.2.65 – 10.158.2.65	10.158.2.65
67	10.158.2.66/32	10.158.2.66 – 10.158.2.66	10.158.2.66
68	10.158.2.67/32	10.158.2.67 – 10.158.2.67	10.158.2.67
69	10.158.2.68/32	10.158.2.68 – 10.158.2.68	10.158.2.68
70	10.158.2.69/32	10.158.2.69 – 10.158.2.69	10.158.2.69
71	10.158.2.70/32	10.158.2.70 – 10.158.2.70	10.158.2.70
72	10.158.2.71/32	10.158.2.71 – 10.158.2.71	10.158.2.71
73	10.158.2.72/32	10.158.2.72 – 10.158.2.72	10.158.2.72
74	10.158.2.73/32	10.158.2.73 – 10.158.2.73	10.158.2.73
75	10.158.2.74/32	10.158.2.74 – 10.158.2.74	10.158.2.74
76	10.158.2.75/32	10.158.2.75 – 10.158.2.75	10.158.2.75
77	10.158.2.76/32	10.158.2.76 – 10.158.2.76	10.158.2.76
78	10.158.2.77/32	10.158.2.77 – 10.158.2.77	10.158.2.77
79	10.158.2.78/32	10.158.2.78 – 10.158.2.78	10.158.2.78
80	10.158.2.79/32	10.158.2.79 – 10.158.2.79	10.158.2.79
81	10.158.2.80/32	10.158.2.80 – 10.158.2.80	10.158.2.80
82	10.158.2.81/32	10.158.2.81 – 10.158.2.81	10.158.2.81
83	10.158.2.82/32	10.158.2.82 – 10.158.2.82	10.158.2.82
84	10.158.2.83/32	10.158.2.83 – 10.158.2.83	10.158.2.83
85	10.158.2.84/32	10.158.2.84 – 10.158.2.84	10.158.2.84
86	10.158.2.85/32	10.158.2.85 – 10.158.2.85	10.158.2.85
87	10.158.2.86/32	10.158.2.86 – 10.158.2.86	10.158.2.86
88	10.158.2.87/32	10.158.2.87 – 10.158.2.87	10.158.2.87
89	10.158.2.88/32	10.158.2.88 – 10.158.2.88	10.158.2.88
90	10.158.2.89/32	10.158.2.89 – 10.158.2.89	10.158.2.89
91	10.158.2.90/32	10.158.2.90 – 10.158.2.90	10.158.2.90
92	10.158.2.91/32	10.158.2.91 – 10.158.2.91	10.158.2.91
93	10.158.2.92/32	10.158.2.92 – 10.158.2.92	10.158.2.92
94	10.158.2.93/32	10.158.2.93 – 10.158.2.93	10.158.2.93
95	10.158.2.94/32	10.158.2.94 – 10.158.2.94	10.158.2.94
96	10.158.2.95/32	10.158.2.95 – 10.158.2.95	10.158.2.95
97	10.158.2.96/32	10.158.2.96 – 10.158.2.96	10.158.2.96
98	10.158.2.97/32	10.158.2.97 – 10.158.2.97	10.158.2.97
99	10.158.2.98/32	10.158.2.98 – 10.158.2.98	10.158.2.98
100	10.158.2.99/32	10.158.2.99 – 10.158.2.99	10.158.2.99
101	10.158.2.100/32	10.158.2.100 – 10.158.2.100	10.158.2.100
102	10.158.2.101/32	10.158.2.101 – 10.158.2.101	10.158.2.101
103	10.158.2.102/32	10.158.2.102 – 10.158.2.102	10.158.2.102
104	10.158.2.103/32	10.158.2.103 – 10.158.2.103	10.158.2.103
105	10.158.2.104/32	10.158.2.104 – 10.158.2.104	10.158.2.104
106	10.158.2.105/32	10.158.2.105 – 10.158.2.105	10.158.2.105
107	10.158.2.106/32	10.158.2.106 – 10.158.2.106	10.158.2.106
108	10.158.2.107/32	10.158.2.107 – 10.158.2.107	10.158.2.107
109	10.158.2.108/32	10.158.2.108 – 10.158.2.108	10.158.2.108
110	10.158.2.109/32	10.158.2.109 – 10.158.2.109	10.158.2.109
111	10.158.2.110/32	10.158.2.110 – 10.158.2.110	10.158.2.110
112	10.158.2.111/32	10.158.2.111 – 10.158.2.111	10.158.2.111
113	10.158.2.112/32	10.158.2.112 – 10.158.2.112	10.158.2.112
114	10.158.2.113/32	10.158.2.113 – 10.158.2.113	10.158.2.113
115	10.158.2.114/32	10.158.2.114 – 10.158.2.114	10.158.2.114
116	10.158.2.115/32	10.158.2.115 – 10.158.2.115	10.158.2.115
117	10.158.2.116/32	10.158.2.116 – 10.158.2.116	10.158.2.116
118	10.158.2.117/32	10.158.2.117 – 10.158.2.117	10.158.2.117
119	10.158.2.118/32	10.158.2.118 – 10.158.2.118	10.158.2.118
120	10.158.2.119/32	10.158.2.119 – 10.158.2.119	10.158.2.119
121	10.158.2.120/32	10.158.2.120 – 10.158.2.120	10.158.2.120
122	10.158.2.121/32	10.158.2.121 – 10.158.2.121	10.158.2.121
123	10.158.2.122/32	10.158.2.122 – 10.158.2.122	10.158.2.122
124	10.158.2.123/32	10.158.2.123 – 10.158.2.123	10.158.2.123
125	10.158.2.124/32	10.158.2.124 – 10.158.2.124	10.158.2.124
126	10.158.2.125/32	10.158.2.125 – 10.158.2.125	10.158.2.125
127	10.158.2.126/32	10.158.2.126 – 10.158.2.126	10.158.2.126
128	10.158.2.127/32	10.158.2.127 – 10.158.2.127	10.158.2.127

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 →