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)10.13.158.0/25

network10.13.158.0/25

broadcast10.13.158.127

first host10.13.158.1

last host10.13.158.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.13.158.0/25

address00001010.00001101.10011110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00001101.10011110.00000000

broadcast00001010.00001101.10011110.01111111

green = network part, grey = host part

hex0x0a0d9e00

decimal168664576

reverse dns0.158.13.10.in-addr.arpa

ipv4-mapped::ffff:a0d:9e00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.13.158.0/32	10.13.158.0 – 10.13.158.0	10.13.158.0
2	10.13.158.1/32	10.13.158.1 – 10.13.158.1	10.13.158.1
3	10.13.158.2/32	10.13.158.2 – 10.13.158.2	10.13.158.2
4	10.13.158.3/32	10.13.158.3 – 10.13.158.3	10.13.158.3
5	10.13.158.4/32	10.13.158.4 – 10.13.158.4	10.13.158.4
6	10.13.158.5/32	10.13.158.5 – 10.13.158.5	10.13.158.5
7	10.13.158.6/32	10.13.158.6 – 10.13.158.6	10.13.158.6
8	10.13.158.7/32	10.13.158.7 – 10.13.158.7	10.13.158.7
9	10.13.158.8/32	10.13.158.8 – 10.13.158.8	10.13.158.8
10	10.13.158.9/32	10.13.158.9 – 10.13.158.9	10.13.158.9
11	10.13.158.10/32	10.13.158.10 – 10.13.158.10	10.13.158.10
12	10.13.158.11/32	10.13.158.11 – 10.13.158.11	10.13.158.11
13	10.13.158.12/32	10.13.158.12 – 10.13.158.12	10.13.158.12
14	10.13.158.13/32	10.13.158.13 – 10.13.158.13	10.13.158.13
15	10.13.158.14/32	10.13.158.14 – 10.13.158.14	10.13.158.14
16	10.13.158.15/32	10.13.158.15 – 10.13.158.15	10.13.158.15
17	10.13.158.16/32	10.13.158.16 – 10.13.158.16	10.13.158.16
18	10.13.158.17/32	10.13.158.17 – 10.13.158.17	10.13.158.17
19	10.13.158.18/32	10.13.158.18 – 10.13.158.18	10.13.158.18
20	10.13.158.19/32	10.13.158.19 – 10.13.158.19	10.13.158.19
21	10.13.158.20/32	10.13.158.20 – 10.13.158.20	10.13.158.20
22	10.13.158.21/32	10.13.158.21 – 10.13.158.21	10.13.158.21
23	10.13.158.22/32	10.13.158.22 – 10.13.158.22	10.13.158.22
24	10.13.158.23/32	10.13.158.23 – 10.13.158.23	10.13.158.23
25	10.13.158.24/32	10.13.158.24 – 10.13.158.24	10.13.158.24
26	10.13.158.25/32	10.13.158.25 – 10.13.158.25	10.13.158.25
27	10.13.158.26/32	10.13.158.26 – 10.13.158.26	10.13.158.26
28	10.13.158.27/32	10.13.158.27 – 10.13.158.27	10.13.158.27
29	10.13.158.28/32	10.13.158.28 – 10.13.158.28	10.13.158.28
30	10.13.158.29/32	10.13.158.29 – 10.13.158.29	10.13.158.29
31	10.13.158.30/32	10.13.158.30 – 10.13.158.30	10.13.158.30
32	10.13.158.31/32	10.13.158.31 – 10.13.158.31	10.13.158.31
33	10.13.158.32/32	10.13.158.32 – 10.13.158.32	10.13.158.32
34	10.13.158.33/32	10.13.158.33 – 10.13.158.33	10.13.158.33
35	10.13.158.34/32	10.13.158.34 – 10.13.158.34	10.13.158.34
36	10.13.158.35/32	10.13.158.35 – 10.13.158.35	10.13.158.35
37	10.13.158.36/32	10.13.158.36 – 10.13.158.36	10.13.158.36
38	10.13.158.37/32	10.13.158.37 – 10.13.158.37	10.13.158.37
39	10.13.158.38/32	10.13.158.38 – 10.13.158.38	10.13.158.38
40	10.13.158.39/32	10.13.158.39 – 10.13.158.39	10.13.158.39
41	10.13.158.40/32	10.13.158.40 – 10.13.158.40	10.13.158.40
42	10.13.158.41/32	10.13.158.41 – 10.13.158.41	10.13.158.41
43	10.13.158.42/32	10.13.158.42 – 10.13.158.42	10.13.158.42
44	10.13.158.43/32	10.13.158.43 – 10.13.158.43	10.13.158.43
45	10.13.158.44/32	10.13.158.44 – 10.13.158.44	10.13.158.44
46	10.13.158.45/32	10.13.158.45 – 10.13.158.45	10.13.158.45
47	10.13.158.46/32	10.13.158.46 – 10.13.158.46	10.13.158.46
48	10.13.158.47/32	10.13.158.47 – 10.13.158.47	10.13.158.47
49	10.13.158.48/32	10.13.158.48 – 10.13.158.48	10.13.158.48
50	10.13.158.49/32	10.13.158.49 – 10.13.158.49	10.13.158.49
51	10.13.158.50/32	10.13.158.50 – 10.13.158.50	10.13.158.50
52	10.13.158.51/32	10.13.158.51 – 10.13.158.51	10.13.158.51
53	10.13.158.52/32	10.13.158.52 – 10.13.158.52	10.13.158.52
54	10.13.158.53/32	10.13.158.53 – 10.13.158.53	10.13.158.53
55	10.13.158.54/32	10.13.158.54 – 10.13.158.54	10.13.158.54
56	10.13.158.55/32	10.13.158.55 – 10.13.158.55	10.13.158.55
57	10.13.158.56/32	10.13.158.56 – 10.13.158.56	10.13.158.56
58	10.13.158.57/32	10.13.158.57 – 10.13.158.57	10.13.158.57
59	10.13.158.58/32	10.13.158.58 – 10.13.158.58	10.13.158.58
60	10.13.158.59/32	10.13.158.59 – 10.13.158.59	10.13.158.59
61	10.13.158.60/32	10.13.158.60 – 10.13.158.60	10.13.158.60
62	10.13.158.61/32	10.13.158.61 – 10.13.158.61	10.13.158.61
63	10.13.158.62/32	10.13.158.62 – 10.13.158.62	10.13.158.62
64	10.13.158.63/32	10.13.158.63 – 10.13.158.63	10.13.158.63
65	10.13.158.64/32	10.13.158.64 – 10.13.158.64	10.13.158.64
66	10.13.158.65/32	10.13.158.65 – 10.13.158.65	10.13.158.65
67	10.13.158.66/32	10.13.158.66 – 10.13.158.66	10.13.158.66
68	10.13.158.67/32	10.13.158.67 – 10.13.158.67	10.13.158.67
69	10.13.158.68/32	10.13.158.68 – 10.13.158.68	10.13.158.68
70	10.13.158.69/32	10.13.158.69 – 10.13.158.69	10.13.158.69
71	10.13.158.70/32	10.13.158.70 – 10.13.158.70	10.13.158.70
72	10.13.158.71/32	10.13.158.71 – 10.13.158.71	10.13.158.71
73	10.13.158.72/32	10.13.158.72 – 10.13.158.72	10.13.158.72
74	10.13.158.73/32	10.13.158.73 – 10.13.158.73	10.13.158.73
75	10.13.158.74/32	10.13.158.74 – 10.13.158.74	10.13.158.74
76	10.13.158.75/32	10.13.158.75 – 10.13.158.75	10.13.158.75
77	10.13.158.76/32	10.13.158.76 – 10.13.158.76	10.13.158.76
78	10.13.158.77/32	10.13.158.77 – 10.13.158.77	10.13.158.77
79	10.13.158.78/32	10.13.158.78 – 10.13.158.78	10.13.158.78
80	10.13.158.79/32	10.13.158.79 – 10.13.158.79	10.13.158.79
81	10.13.158.80/32	10.13.158.80 – 10.13.158.80	10.13.158.80
82	10.13.158.81/32	10.13.158.81 – 10.13.158.81	10.13.158.81
83	10.13.158.82/32	10.13.158.82 – 10.13.158.82	10.13.158.82
84	10.13.158.83/32	10.13.158.83 – 10.13.158.83	10.13.158.83
85	10.13.158.84/32	10.13.158.84 – 10.13.158.84	10.13.158.84
86	10.13.158.85/32	10.13.158.85 – 10.13.158.85	10.13.158.85
87	10.13.158.86/32	10.13.158.86 – 10.13.158.86	10.13.158.86
88	10.13.158.87/32	10.13.158.87 – 10.13.158.87	10.13.158.87
89	10.13.158.88/32	10.13.158.88 – 10.13.158.88	10.13.158.88
90	10.13.158.89/32	10.13.158.89 – 10.13.158.89	10.13.158.89
91	10.13.158.90/32	10.13.158.90 – 10.13.158.90	10.13.158.90
92	10.13.158.91/32	10.13.158.91 – 10.13.158.91	10.13.158.91
93	10.13.158.92/32	10.13.158.92 – 10.13.158.92	10.13.158.92
94	10.13.158.93/32	10.13.158.93 – 10.13.158.93	10.13.158.93
95	10.13.158.94/32	10.13.158.94 – 10.13.158.94	10.13.158.94
96	10.13.158.95/32	10.13.158.95 – 10.13.158.95	10.13.158.95
97	10.13.158.96/32	10.13.158.96 – 10.13.158.96	10.13.158.96
98	10.13.158.97/32	10.13.158.97 – 10.13.158.97	10.13.158.97
99	10.13.158.98/32	10.13.158.98 – 10.13.158.98	10.13.158.98
100	10.13.158.99/32	10.13.158.99 – 10.13.158.99	10.13.158.99
101	10.13.158.100/32	10.13.158.100 – 10.13.158.100	10.13.158.100
102	10.13.158.101/32	10.13.158.101 – 10.13.158.101	10.13.158.101
103	10.13.158.102/32	10.13.158.102 – 10.13.158.102	10.13.158.102
104	10.13.158.103/32	10.13.158.103 – 10.13.158.103	10.13.158.103
105	10.13.158.104/32	10.13.158.104 – 10.13.158.104	10.13.158.104
106	10.13.158.105/32	10.13.158.105 – 10.13.158.105	10.13.158.105
107	10.13.158.106/32	10.13.158.106 – 10.13.158.106	10.13.158.106
108	10.13.158.107/32	10.13.158.107 – 10.13.158.107	10.13.158.107
109	10.13.158.108/32	10.13.158.108 – 10.13.158.108	10.13.158.108
110	10.13.158.109/32	10.13.158.109 – 10.13.158.109	10.13.158.109
111	10.13.158.110/32	10.13.158.110 – 10.13.158.110	10.13.158.110
112	10.13.158.111/32	10.13.158.111 – 10.13.158.111	10.13.158.111
113	10.13.158.112/32	10.13.158.112 – 10.13.158.112	10.13.158.112
114	10.13.158.113/32	10.13.158.113 – 10.13.158.113	10.13.158.113
115	10.13.158.114/32	10.13.158.114 – 10.13.158.114	10.13.158.114
116	10.13.158.115/32	10.13.158.115 – 10.13.158.115	10.13.158.115
117	10.13.158.116/32	10.13.158.116 – 10.13.158.116	10.13.158.116
118	10.13.158.117/32	10.13.158.117 – 10.13.158.117	10.13.158.117
119	10.13.158.118/32	10.13.158.118 – 10.13.158.118	10.13.158.118
120	10.13.158.119/32	10.13.158.119 – 10.13.158.119	10.13.158.119
121	10.13.158.120/32	10.13.158.120 – 10.13.158.120	10.13.158.120
122	10.13.158.121/32	10.13.158.121 – 10.13.158.121	10.13.158.121
123	10.13.158.122/32	10.13.158.122 – 10.13.158.122	10.13.158.122
124	10.13.158.123/32	10.13.158.123 – 10.13.158.123	10.13.158.123
125	10.13.158.124/32	10.13.158.124 – 10.13.158.124	10.13.158.124
126	10.13.158.125/32	10.13.158.125 – 10.13.158.125	10.13.158.125
127	10.13.158.126/32	10.13.158.126 – 10.13.158.126	10.13.158.126
128	10.13.158.127/32	10.13.158.127 – 10.13.158.127	10.13.158.127

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 →