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)10.158.13.0/25

network10.158.13.0/25

broadcast10.158.13.127

first host10.158.13.1

last host10.158.13.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.158.13.0/25

address00001010.10011110.00001101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10011110.00001101.00000000

broadcast00001010.10011110.00001101.01111111

green = network part, grey = host part

hex0x0a9e0d00

decimal178130176

reverse dns0.13.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:d00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.13.0/32	10.158.13.0 – 10.158.13.0	10.158.13.0
2	10.158.13.1/32	10.158.13.1 – 10.158.13.1	10.158.13.1
3	10.158.13.2/32	10.158.13.2 – 10.158.13.2	10.158.13.2
4	10.158.13.3/32	10.158.13.3 – 10.158.13.3	10.158.13.3
5	10.158.13.4/32	10.158.13.4 – 10.158.13.4	10.158.13.4
6	10.158.13.5/32	10.158.13.5 – 10.158.13.5	10.158.13.5
7	10.158.13.6/32	10.158.13.6 – 10.158.13.6	10.158.13.6
8	10.158.13.7/32	10.158.13.7 – 10.158.13.7	10.158.13.7
9	10.158.13.8/32	10.158.13.8 – 10.158.13.8	10.158.13.8
10	10.158.13.9/32	10.158.13.9 – 10.158.13.9	10.158.13.9
11	10.158.13.10/32	10.158.13.10 – 10.158.13.10	10.158.13.10
12	10.158.13.11/32	10.158.13.11 – 10.158.13.11	10.158.13.11
13	10.158.13.12/32	10.158.13.12 – 10.158.13.12	10.158.13.12
14	10.158.13.13/32	10.158.13.13 – 10.158.13.13	10.158.13.13
15	10.158.13.14/32	10.158.13.14 – 10.158.13.14	10.158.13.14
16	10.158.13.15/32	10.158.13.15 – 10.158.13.15	10.158.13.15
17	10.158.13.16/32	10.158.13.16 – 10.158.13.16	10.158.13.16
18	10.158.13.17/32	10.158.13.17 – 10.158.13.17	10.158.13.17
19	10.158.13.18/32	10.158.13.18 – 10.158.13.18	10.158.13.18
20	10.158.13.19/32	10.158.13.19 – 10.158.13.19	10.158.13.19
21	10.158.13.20/32	10.158.13.20 – 10.158.13.20	10.158.13.20
22	10.158.13.21/32	10.158.13.21 – 10.158.13.21	10.158.13.21
23	10.158.13.22/32	10.158.13.22 – 10.158.13.22	10.158.13.22
24	10.158.13.23/32	10.158.13.23 – 10.158.13.23	10.158.13.23
25	10.158.13.24/32	10.158.13.24 – 10.158.13.24	10.158.13.24
26	10.158.13.25/32	10.158.13.25 – 10.158.13.25	10.158.13.25
27	10.158.13.26/32	10.158.13.26 – 10.158.13.26	10.158.13.26
28	10.158.13.27/32	10.158.13.27 – 10.158.13.27	10.158.13.27
29	10.158.13.28/32	10.158.13.28 – 10.158.13.28	10.158.13.28
30	10.158.13.29/32	10.158.13.29 – 10.158.13.29	10.158.13.29
31	10.158.13.30/32	10.158.13.30 – 10.158.13.30	10.158.13.30
32	10.158.13.31/32	10.158.13.31 – 10.158.13.31	10.158.13.31
33	10.158.13.32/32	10.158.13.32 – 10.158.13.32	10.158.13.32
34	10.158.13.33/32	10.158.13.33 – 10.158.13.33	10.158.13.33
35	10.158.13.34/32	10.158.13.34 – 10.158.13.34	10.158.13.34
36	10.158.13.35/32	10.158.13.35 – 10.158.13.35	10.158.13.35
37	10.158.13.36/32	10.158.13.36 – 10.158.13.36	10.158.13.36
38	10.158.13.37/32	10.158.13.37 – 10.158.13.37	10.158.13.37
39	10.158.13.38/32	10.158.13.38 – 10.158.13.38	10.158.13.38
40	10.158.13.39/32	10.158.13.39 – 10.158.13.39	10.158.13.39
41	10.158.13.40/32	10.158.13.40 – 10.158.13.40	10.158.13.40
42	10.158.13.41/32	10.158.13.41 – 10.158.13.41	10.158.13.41
43	10.158.13.42/32	10.158.13.42 – 10.158.13.42	10.158.13.42
44	10.158.13.43/32	10.158.13.43 – 10.158.13.43	10.158.13.43
45	10.158.13.44/32	10.158.13.44 – 10.158.13.44	10.158.13.44
46	10.158.13.45/32	10.158.13.45 – 10.158.13.45	10.158.13.45
47	10.158.13.46/32	10.158.13.46 – 10.158.13.46	10.158.13.46
48	10.158.13.47/32	10.158.13.47 – 10.158.13.47	10.158.13.47
49	10.158.13.48/32	10.158.13.48 – 10.158.13.48	10.158.13.48
50	10.158.13.49/32	10.158.13.49 – 10.158.13.49	10.158.13.49
51	10.158.13.50/32	10.158.13.50 – 10.158.13.50	10.158.13.50
52	10.158.13.51/32	10.158.13.51 – 10.158.13.51	10.158.13.51
53	10.158.13.52/32	10.158.13.52 – 10.158.13.52	10.158.13.52
54	10.158.13.53/32	10.158.13.53 – 10.158.13.53	10.158.13.53
55	10.158.13.54/32	10.158.13.54 – 10.158.13.54	10.158.13.54
56	10.158.13.55/32	10.158.13.55 – 10.158.13.55	10.158.13.55
57	10.158.13.56/32	10.158.13.56 – 10.158.13.56	10.158.13.56
58	10.158.13.57/32	10.158.13.57 – 10.158.13.57	10.158.13.57
59	10.158.13.58/32	10.158.13.58 – 10.158.13.58	10.158.13.58
60	10.158.13.59/32	10.158.13.59 – 10.158.13.59	10.158.13.59
61	10.158.13.60/32	10.158.13.60 – 10.158.13.60	10.158.13.60
62	10.158.13.61/32	10.158.13.61 – 10.158.13.61	10.158.13.61
63	10.158.13.62/32	10.158.13.62 – 10.158.13.62	10.158.13.62
64	10.158.13.63/32	10.158.13.63 – 10.158.13.63	10.158.13.63
65	10.158.13.64/32	10.158.13.64 – 10.158.13.64	10.158.13.64
66	10.158.13.65/32	10.158.13.65 – 10.158.13.65	10.158.13.65
67	10.158.13.66/32	10.158.13.66 – 10.158.13.66	10.158.13.66
68	10.158.13.67/32	10.158.13.67 – 10.158.13.67	10.158.13.67
69	10.158.13.68/32	10.158.13.68 – 10.158.13.68	10.158.13.68
70	10.158.13.69/32	10.158.13.69 – 10.158.13.69	10.158.13.69
71	10.158.13.70/32	10.158.13.70 – 10.158.13.70	10.158.13.70
72	10.158.13.71/32	10.158.13.71 – 10.158.13.71	10.158.13.71
73	10.158.13.72/32	10.158.13.72 – 10.158.13.72	10.158.13.72
74	10.158.13.73/32	10.158.13.73 – 10.158.13.73	10.158.13.73
75	10.158.13.74/32	10.158.13.74 – 10.158.13.74	10.158.13.74
76	10.158.13.75/32	10.158.13.75 – 10.158.13.75	10.158.13.75
77	10.158.13.76/32	10.158.13.76 – 10.158.13.76	10.158.13.76
78	10.158.13.77/32	10.158.13.77 – 10.158.13.77	10.158.13.77
79	10.158.13.78/32	10.158.13.78 – 10.158.13.78	10.158.13.78
80	10.158.13.79/32	10.158.13.79 – 10.158.13.79	10.158.13.79
81	10.158.13.80/32	10.158.13.80 – 10.158.13.80	10.158.13.80
82	10.158.13.81/32	10.158.13.81 – 10.158.13.81	10.158.13.81
83	10.158.13.82/32	10.158.13.82 – 10.158.13.82	10.158.13.82
84	10.158.13.83/32	10.158.13.83 – 10.158.13.83	10.158.13.83
85	10.158.13.84/32	10.158.13.84 – 10.158.13.84	10.158.13.84
86	10.158.13.85/32	10.158.13.85 – 10.158.13.85	10.158.13.85
87	10.158.13.86/32	10.158.13.86 – 10.158.13.86	10.158.13.86
88	10.158.13.87/32	10.158.13.87 – 10.158.13.87	10.158.13.87
89	10.158.13.88/32	10.158.13.88 – 10.158.13.88	10.158.13.88
90	10.158.13.89/32	10.158.13.89 – 10.158.13.89	10.158.13.89
91	10.158.13.90/32	10.158.13.90 – 10.158.13.90	10.158.13.90
92	10.158.13.91/32	10.158.13.91 – 10.158.13.91	10.158.13.91
93	10.158.13.92/32	10.158.13.92 – 10.158.13.92	10.158.13.92
94	10.158.13.93/32	10.158.13.93 – 10.158.13.93	10.158.13.93
95	10.158.13.94/32	10.158.13.94 – 10.158.13.94	10.158.13.94
96	10.158.13.95/32	10.158.13.95 – 10.158.13.95	10.158.13.95
97	10.158.13.96/32	10.158.13.96 – 10.158.13.96	10.158.13.96
98	10.158.13.97/32	10.158.13.97 – 10.158.13.97	10.158.13.97
99	10.158.13.98/32	10.158.13.98 – 10.158.13.98	10.158.13.98
100	10.158.13.99/32	10.158.13.99 – 10.158.13.99	10.158.13.99
101	10.158.13.100/32	10.158.13.100 – 10.158.13.100	10.158.13.100
102	10.158.13.101/32	10.158.13.101 – 10.158.13.101	10.158.13.101
103	10.158.13.102/32	10.158.13.102 – 10.158.13.102	10.158.13.102
104	10.158.13.103/32	10.158.13.103 – 10.158.13.103	10.158.13.103
105	10.158.13.104/32	10.158.13.104 – 10.158.13.104	10.158.13.104
106	10.158.13.105/32	10.158.13.105 – 10.158.13.105	10.158.13.105
107	10.158.13.106/32	10.158.13.106 – 10.158.13.106	10.158.13.106
108	10.158.13.107/32	10.158.13.107 – 10.158.13.107	10.158.13.107
109	10.158.13.108/32	10.158.13.108 – 10.158.13.108	10.158.13.108
110	10.158.13.109/32	10.158.13.109 – 10.158.13.109	10.158.13.109
111	10.158.13.110/32	10.158.13.110 – 10.158.13.110	10.158.13.110
112	10.158.13.111/32	10.158.13.111 – 10.158.13.111	10.158.13.111
113	10.158.13.112/32	10.158.13.112 – 10.158.13.112	10.158.13.112
114	10.158.13.113/32	10.158.13.113 – 10.158.13.113	10.158.13.113
115	10.158.13.114/32	10.158.13.114 – 10.158.13.114	10.158.13.114
116	10.158.13.115/32	10.158.13.115 – 10.158.13.115	10.158.13.115
117	10.158.13.116/32	10.158.13.116 – 10.158.13.116	10.158.13.116
118	10.158.13.117/32	10.158.13.117 – 10.158.13.117	10.158.13.117
119	10.158.13.118/32	10.158.13.118 – 10.158.13.118	10.158.13.118
120	10.158.13.119/32	10.158.13.119 – 10.158.13.119	10.158.13.119
121	10.158.13.120/32	10.158.13.120 – 10.158.13.120	10.158.13.120
122	10.158.13.121/32	10.158.13.121 – 10.158.13.121	10.158.13.121
123	10.158.13.122/32	10.158.13.122 – 10.158.13.122	10.158.13.122
124	10.158.13.123/32	10.158.13.123 – 10.158.13.123	10.158.13.123
125	10.158.13.124/32	10.158.13.124 – 10.158.13.124	10.158.13.124
126	10.158.13.125/32	10.158.13.125 – 10.158.13.125	10.158.13.125
127	10.158.13.126/32	10.158.13.126 – 10.158.13.126	10.158.13.126
128	10.158.13.127/32	10.158.13.127 – 10.158.13.127	10.158.13.127

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 →