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)10.158.41.0/25

network10.158.41.0/25

broadcast10.158.41.127

first host10.158.41.1

last host10.158.41.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.158.41.0/25

address00001010.10011110.00101001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10011110.00101001.00000000

broadcast00001010.10011110.00101001.01111111

green = network part, grey = host part

hex0x0a9e2900

decimal178137344

reverse dns0.41.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:2900

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.41.0/32	10.158.41.0 – 10.158.41.0	10.158.41.0
2	10.158.41.1/32	10.158.41.1 – 10.158.41.1	10.158.41.1
3	10.158.41.2/32	10.158.41.2 – 10.158.41.2	10.158.41.2
4	10.158.41.3/32	10.158.41.3 – 10.158.41.3	10.158.41.3
5	10.158.41.4/32	10.158.41.4 – 10.158.41.4	10.158.41.4
6	10.158.41.5/32	10.158.41.5 – 10.158.41.5	10.158.41.5
7	10.158.41.6/32	10.158.41.6 – 10.158.41.6	10.158.41.6
8	10.158.41.7/32	10.158.41.7 – 10.158.41.7	10.158.41.7
9	10.158.41.8/32	10.158.41.8 – 10.158.41.8	10.158.41.8
10	10.158.41.9/32	10.158.41.9 – 10.158.41.9	10.158.41.9
11	10.158.41.10/32	10.158.41.10 – 10.158.41.10	10.158.41.10
12	10.158.41.11/32	10.158.41.11 – 10.158.41.11	10.158.41.11
13	10.158.41.12/32	10.158.41.12 – 10.158.41.12	10.158.41.12
14	10.158.41.13/32	10.158.41.13 – 10.158.41.13	10.158.41.13
15	10.158.41.14/32	10.158.41.14 – 10.158.41.14	10.158.41.14
16	10.158.41.15/32	10.158.41.15 – 10.158.41.15	10.158.41.15
17	10.158.41.16/32	10.158.41.16 – 10.158.41.16	10.158.41.16
18	10.158.41.17/32	10.158.41.17 – 10.158.41.17	10.158.41.17
19	10.158.41.18/32	10.158.41.18 – 10.158.41.18	10.158.41.18
20	10.158.41.19/32	10.158.41.19 – 10.158.41.19	10.158.41.19
21	10.158.41.20/32	10.158.41.20 – 10.158.41.20	10.158.41.20
22	10.158.41.21/32	10.158.41.21 – 10.158.41.21	10.158.41.21
23	10.158.41.22/32	10.158.41.22 – 10.158.41.22	10.158.41.22
24	10.158.41.23/32	10.158.41.23 – 10.158.41.23	10.158.41.23
25	10.158.41.24/32	10.158.41.24 – 10.158.41.24	10.158.41.24
26	10.158.41.25/32	10.158.41.25 – 10.158.41.25	10.158.41.25
27	10.158.41.26/32	10.158.41.26 – 10.158.41.26	10.158.41.26
28	10.158.41.27/32	10.158.41.27 – 10.158.41.27	10.158.41.27
29	10.158.41.28/32	10.158.41.28 – 10.158.41.28	10.158.41.28
30	10.158.41.29/32	10.158.41.29 – 10.158.41.29	10.158.41.29
31	10.158.41.30/32	10.158.41.30 – 10.158.41.30	10.158.41.30
32	10.158.41.31/32	10.158.41.31 – 10.158.41.31	10.158.41.31
33	10.158.41.32/32	10.158.41.32 – 10.158.41.32	10.158.41.32
34	10.158.41.33/32	10.158.41.33 – 10.158.41.33	10.158.41.33
35	10.158.41.34/32	10.158.41.34 – 10.158.41.34	10.158.41.34
36	10.158.41.35/32	10.158.41.35 – 10.158.41.35	10.158.41.35
37	10.158.41.36/32	10.158.41.36 – 10.158.41.36	10.158.41.36
38	10.158.41.37/32	10.158.41.37 – 10.158.41.37	10.158.41.37
39	10.158.41.38/32	10.158.41.38 – 10.158.41.38	10.158.41.38
40	10.158.41.39/32	10.158.41.39 – 10.158.41.39	10.158.41.39
41	10.158.41.40/32	10.158.41.40 – 10.158.41.40	10.158.41.40
42	10.158.41.41/32	10.158.41.41 – 10.158.41.41	10.158.41.41
43	10.158.41.42/32	10.158.41.42 – 10.158.41.42	10.158.41.42
44	10.158.41.43/32	10.158.41.43 – 10.158.41.43	10.158.41.43
45	10.158.41.44/32	10.158.41.44 – 10.158.41.44	10.158.41.44
46	10.158.41.45/32	10.158.41.45 – 10.158.41.45	10.158.41.45
47	10.158.41.46/32	10.158.41.46 – 10.158.41.46	10.158.41.46
48	10.158.41.47/32	10.158.41.47 – 10.158.41.47	10.158.41.47
49	10.158.41.48/32	10.158.41.48 – 10.158.41.48	10.158.41.48
50	10.158.41.49/32	10.158.41.49 – 10.158.41.49	10.158.41.49
51	10.158.41.50/32	10.158.41.50 – 10.158.41.50	10.158.41.50
52	10.158.41.51/32	10.158.41.51 – 10.158.41.51	10.158.41.51
53	10.158.41.52/32	10.158.41.52 – 10.158.41.52	10.158.41.52
54	10.158.41.53/32	10.158.41.53 – 10.158.41.53	10.158.41.53
55	10.158.41.54/32	10.158.41.54 – 10.158.41.54	10.158.41.54
56	10.158.41.55/32	10.158.41.55 – 10.158.41.55	10.158.41.55
57	10.158.41.56/32	10.158.41.56 – 10.158.41.56	10.158.41.56
58	10.158.41.57/32	10.158.41.57 – 10.158.41.57	10.158.41.57
59	10.158.41.58/32	10.158.41.58 – 10.158.41.58	10.158.41.58
60	10.158.41.59/32	10.158.41.59 – 10.158.41.59	10.158.41.59
61	10.158.41.60/32	10.158.41.60 – 10.158.41.60	10.158.41.60
62	10.158.41.61/32	10.158.41.61 – 10.158.41.61	10.158.41.61
63	10.158.41.62/32	10.158.41.62 – 10.158.41.62	10.158.41.62
64	10.158.41.63/32	10.158.41.63 – 10.158.41.63	10.158.41.63
65	10.158.41.64/32	10.158.41.64 – 10.158.41.64	10.158.41.64
66	10.158.41.65/32	10.158.41.65 – 10.158.41.65	10.158.41.65
67	10.158.41.66/32	10.158.41.66 – 10.158.41.66	10.158.41.66
68	10.158.41.67/32	10.158.41.67 – 10.158.41.67	10.158.41.67
69	10.158.41.68/32	10.158.41.68 – 10.158.41.68	10.158.41.68
70	10.158.41.69/32	10.158.41.69 – 10.158.41.69	10.158.41.69
71	10.158.41.70/32	10.158.41.70 – 10.158.41.70	10.158.41.70
72	10.158.41.71/32	10.158.41.71 – 10.158.41.71	10.158.41.71
73	10.158.41.72/32	10.158.41.72 – 10.158.41.72	10.158.41.72
74	10.158.41.73/32	10.158.41.73 – 10.158.41.73	10.158.41.73
75	10.158.41.74/32	10.158.41.74 – 10.158.41.74	10.158.41.74
76	10.158.41.75/32	10.158.41.75 – 10.158.41.75	10.158.41.75
77	10.158.41.76/32	10.158.41.76 – 10.158.41.76	10.158.41.76
78	10.158.41.77/32	10.158.41.77 – 10.158.41.77	10.158.41.77
79	10.158.41.78/32	10.158.41.78 – 10.158.41.78	10.158.41.78
80	10.158.41.79/32	10.158.41.79 – 10.158.41.79	10.158.41.79
81	10.158.41.80/32	10.158.41.80 – 10.158.41.80	10.158.41.80
82	10.158.41.81/32	10.158.41.81 – 10.158.41.81	10.158.41.81
83	10.158.41.82/32	10.158.41.82 – 10.158.41.82	10.158.41.82
84	10.158.41.83/32	10.158.41.83 – 10.158.41.83	10.158.41.83
85	10.158.41.84/32	10.158.41.84 – 10.158.41.84	10.158.41.84
86	10.158.41.85/32	10.158.41.85 – 10.158.41.85	10.158.41.85
87	10.158.41.86/32	10.158.41.86 – 10.158.41.86	10.158.41.86
88	10.158.41.87/32	10.158.41.87 – 10.158.41.87	10.158.41.87
89	10.158.41.88/32	10.158.41.88 – 10.158.41.88	10.158.41.88
90	10.158.41.89/32	10.158.41.89 – 10.158.41.89	10.158.41.89
91	10.158.41.90/32	10.158.41.90 – 10.158.41.90	10.158.41.90
92	10.158.41.91/32	10.158.41.91 – 10.158.41.91	10.158.41.91
93	10.158.41.92/32	10.158.41.92 – 10.158.41.92	10.158.41.92
94	10.158.41.93/32	10.158.41.93 – 10.158.41.93	10.158.41.93
95	10.158.41.94/32	10.158.41.94 – 10.158.41.94	10.158.41.94
96	10.158.41.95/32	10.158.41.95 – 10.158.41.95	10.158.41.95
97	10.158.41.96/32	10.158.41.96 – 10.158.41.96	10.158.41.96
98	10.158.41.97/32	10.158.41.97 – 10.158.41.97	10.158.41.97
99	10.158.41.98/32	10.158.41.98 – 10.158.41.98	10.158.41.98
100	10.158.41.99/32	10.158.41.99 – 10.158.41.99	10.158.41.99
101	10.158.41.100/32	10.158.41.100 – 10.158.41.100	10.158.41.100
102	10.158.41.101/32	10.158.41.101 – 10.158.41.101	10.158.41.101
103	10.158.41.102/32	10.158.41.102 – 10.158.41.102	10.158.41.102
104	10.158.41.103/32	10.158.41.103 – 10.158.41.103	10.158.41.103
105	10.158.41.104/32	10.158.41.104 – 10.158.41.104	10.158.41.104
106	10.158.41.105/32	10.158.41.105 – 10.158.41.105	10.158.41.105
107	10.158.41.106/32	10.158.41.106 – 10.158.41.106	10.158.41.106
108	10.158.41.107/32	10.158.41.107 – 10.158.41.107	10.158.41.107
109	10.158.41.108/32	10.158.41.108 – 10.158.41.108	10.158.41.108
110	10.158.41.109/32	10.158.41.109 – 10.158.41.109	10.158.41.109
111	10.158.41.110/32	10.158.41.110 – 10.158.41.110	10.158.41.110
112	10.158.41.111/32	10.158.41.111 – 10.158.41.111	10.158.41.111
113	10.158.41.112/32	10.158.41.112 – 10.158.41.112	10.158.41.112
114	10.158.41.113/32	10.158.41.113 – 10.158.41.113	10.158.41.113
115	10.158.41.114/32	10.158.41.114 – 10.158.41.114	10.158.41.114
116	10.158.41.115/32	10.158.41.115 – 10.158.41.115	10.158.41.115
117	10.158.41.116/32	10.158.41.116 – 10.158.41.116	10.158.41.116
118	10.158.41.117/32	10.158.41.117 – 10.158.41.117	10.158.41.117
119	10.158.41.118/32	10.158.41.118 – 10.158.41.118	10.158.41.118
120	10.158.41.119/32	10.158.41.119 – 10.158.41.119	10.158.41.119
121	10.158.41.120/32	10.158.41.120 – 10.158.41.120	10.158.41.120
122	10.158.41.121/32	10.158.41.121 – 10.158.41.121	10.158.41.121
123	10.158.41.122/32	10.158.41.122 – 10.158.41.122	10.158.41.122
124	10.158.41.123/32	10.158.41.123 – 10.158.41.123	10.158.41.123
125	10.158.41.124/32	10.158.41.124 – 10.158.41.124	10.158.41.124
126	10.158.41.125/32	10.158.41.125 – 10.158.41.125	10.158.41.125
127	10.158.41.126/32	10.158.41.126 – 10.158.41.126	10.158.41.126
128	10.158.41.127/32	10.158.41.127 – 10.158.41.127	10.158.41.127

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 →