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)10.0.106.0/25

network10.0.106.0/25

broadcast10.0.106.127

first host10.0.106.1

last host10.0.106.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.106.0/25

address00001010.00000000.01101010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01101010.00000000

broadcast00001010.00000000.01101010.01111111

green = network part, grey = host part

hex0x0a006a00

decimal167799296

reverse dns0.106.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:6a00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.106.0/32	10.0.106.0 – 10.0.106.0	10.0.106.0
2	10.0.106.1/32	10.0.106.1 – 10.0.106.1	10.0.106.1
3	10.0.106.2/32	10.0.106.2 – 10.0.106.2	10.0.106.2
4	10.0.106.3/32	10.0.106.3 – 10.0.106.3	10.0.106.3
5	10.0.106.4/32	10.0.106.4 – 10.0.106.4	10.0.106.4
6	10.0.106.5/32	10.0.106.5 – 10.0.106.5	10.0.106.5
7	10.0.106.6/32	10.0.106.6 – 10.0.106.6	10.0.106.6
8	10.0.106.7/32	10.0.106.7 – 10.0.106.7	10.0.106.7
9	10.0.106.8/32	10.0.106.8 – 10.0.106.8	10.0.106.8
10	10.0.106.9/32	10.0.106.9 – 10.0.106.9	10.0.106.9
11	10.0.106.10/32	10.0.106.10 – 10.0.106.10	10.0.106.10
12	10.0.106.11/32	10.0.106.11 – 10.0.106.11	10.0.106.11
13	10.0.106.12/32	10.0.106.12 – 10.0.106.12	10.0.106.12
14	10.0.106.13/32	10.0.106.13 – 10.0.106.13	10.0.106.13
15	10.0.106.14/32	10.0.106.14 – 10.0.106.14	10.0.106.14
16	10.0.106.15/32	10.0.106.15 – 10.0.106.15	10.0.106.15
17	10.0.106.16/32	10.0.106.16 – 10.0.106.16	10.0.106.16
18	10.0.106.17/32	10.0.106.17 – 10.0.106.17	10.0.106.17
19	10.0.106.18/32	10.0.106.18 – 10.0.106.18	10.0.106.18
20	10.0.106.19/32	10.0.106.19 – 10.0.106.19	10.0.106.19
21	10.0.106.20/32	10.0.106.20 – 10.0.106.20	10.0.106.20
22	10.0.106.21/32	10.0.106.21 – 10.0.106.21	10.0.106.21
23	10.0.106.22/32	10.0.106.22 – 10.0.106.22	10.0.106.22
24	10.0.106.23/32	10.0.106.23 – 10.0.106.23	10.0.106.23
25	10.0.106.24/32	10.0.106.24 – 10.0.106.24	10.0.106.24
26	10.0.106.25/32	10.0.106.25 – 10.0.106.25	10.0.106.25
27	10.0.106.26/32	10.0.106.26 – 10.0.106.26	10.0.106.26
28	10.0.106.27/32	10.0.106.27 – 10.0.106.27	10.0.106.27
29	10.0.106.28/32	10.0.106.28 – 10.0.106.28	10.0.106.28
30	10.0.106.29/32	10.0.106.29 – 10.0.106.29	10.0.106.29
31	10.0.106.30/32	10.0.106.30 – 10.0.106.30	10.0.106.30
32	10.0.106.31/32	10.0.106.31 – 10.0.106.31	10.0.106.31
33	10.0.106.32/32	10.0.106.32 – 10.0.106.32	10.0.106.32
34	10.0.106.33/32	10.0.106.33 – 10.0.106.33	10.0.106.33
35	10.0.106.34/32	10.0.106.34 – 10.0.106.34	10.0.106.34
36	10.0.106.35/32	10.0.106.35 – 10.0.106.35	10.0.106.35
37	10.0.106.36/32	10.0.106.36 – 10.0.106.36	10.0.106.36
38	10.0.106.37/32	10.0.106.37 – 10.0.106.37	10.0.106.37
39	10.0.106.38/32	10.0.106.38 – 10.0.106.38	10.0.106.38
40	10.0.106.39/32	10.0.106.39 – 10.0.106.39	10.0.106.39
41	10.0.106.40/32	10.0.106.40 – 10.0.106.40	10.0.106.40
42	10.0.106.41/32	10.0.106.41 – 10.0.106.41	10.0.106.41
43	10.0.106.42/32	10.0.106.42 – 10.0.106.42	10.0.106.42
44	10.0.106.43/32	10.0.106.43 – 10.0.106.43	10.0.106.43
45	10.0.106.44/32	10.0.106.44 – 10.0.106.44	10.0.106.44
46	10.0.106.45/32	10.0.106.45 – 10.0.106.45	10.0.106.45
47	10.0.106.46/32	10.0.106.46 – 10.0.106.46	10.0.106.46
48	10.0.106.47/32	10.0.106.47 – 10.0.106.47	10.0.106.47
49	10.0.106.48/32	10.0.106.48 – 10.0.106.48	10.0.106.48
50	10.0.106.49/32	10.0.106.49 – 10.0.106.49	10.0.106.49
51	10.0.106.50/32	10.0.106.50 – 10.0.106.50	10.0.106.50
52	10.0.106.51/32	10.0.106.51 – 10.0.106.51	10.0.106.51
53	10.0.106.52/32	10.0.106.52 – 10.0.106.52	10.0.106.52
54	10.0.106.53/32	10.0.106.53 – 10.0.106.53	10.0.106.53
55	10.0.106.54/32	10.0.106.54 – 10.0.106.54	10.0.106.54
56	10.0.106.55/32	10.0.106.55 – 10.0.106.55	10.0.106.55
57	10.0.106.56/32	10.0.106.56 – 10.0.106.56	10.0.106.56
58	10.0.106.57/32	10.0.106.57 – 10.0.106.57	10.0.106.57
59	10.0.106.58/32	10.0.106.58 – 10.0.106.58	10.0.106.58
60	10.0.106.59/32	10.0.106.59 – 10.0.106.59	10.0.106.59
61	10.0.106.60/32	10.0.106.60 – 10.0.106.60	10.0.106.60
62	10.0.106.61/32	10.0.106.61 – 10.0.106.61	10.0.106.61
63	10.0.106.62/32	10.0.106.62 – 10.0.106.62	10.0.106.62
64	10.0.106.63/32	10.0.106.63 – 10.0.106.63	10.0.106.63
65	10.0.106.64/32	10.0.106.64 – 10.0.106.64	10.0.106.64
66	10.0.106.65/32	10.0.106.65 – 10.0.106.65	10.0.106.65
67	10.0.106.66/32	10.0.106.66 – 10.0.106.66	10.0.106.66
68	10.0.106.67/32	10.0.106.67 – 10.0.106.67	10.0.106.67
69	10.0.106.68/32	10.0.106.68 – 10.0.106.68	10.0.106.68
70	10.0.106.69/32	10.0.106.69 – 10.0.106.69	10.0.106.69
71	10.0.106.70/32	10.0.106.70 – 10.0.106.70	10.0.106.70
72	10.0.106.71/32	10.0.106.71 – 10.0.106.71	10.0.106.71
73	10.0.106.72/32	10.0.106.72 – 10.0.106.72	10.0.106.72
74	10.0.106.73/32	10.0.106.73 – 10.0.106.73	10.0.106.73
75	10.0.106.74/32	10.0.106.74 – 10.0.106.74	10.0.106.74
76	10.0.106.75/32	10.0.106.75 – 10.0.106.75	10.0.106.75
77	10.0.106.76/32	10.0.106.76 – 10.0.106.76	10.0.106.76
78	10.0.106.77/32	10.0.106.77 – 10.0.106.77	10.0.106.77
79	10.0.106.78/32	10.0.106.78 – 10.0.106.78	10.0.106.78
80	10.0.106.79/32	10.0.106.79 – 10.0.106.79	10.0.106.79
81	10.0.106.80/32	10.0.106.80 – 10.0.106.80	10.0.106.80
82	10.0.106.81/32	10.0.106.81 – 10.0.106.81	10.0.106.81
83	10.0.106.82/32	10.0.106.82 – 10.0.106.82	10.0.106.82
84	10.0.106.83/32	10.0.106.83 – 10.0.106.83	10.0.106.83
85	10.0.106.84/32	10.0.106.84 – 10.0.106.84	10.0.106.84
86	10.0.106.85/32	10.0.106.85 – 10.0.106.85	10.0.106.85
87	10.0.106.86/32	10.0.106.86 – 10.0.106.86	10.0.106.86
88	10.0.106.87/32	10.0.106.87 – 10.0.106.87	10.0.106.87
89	10.0.106.88/32	10.0.106.88 – 10.0.106.88	10.0.106.88
90	10.0.106.89/32	10.0.106.89 – 10.0.106.89	10.0.106.89
91	10.0.106.90/32	10.0.106.90 – 10.0.106.90	10.0.106.90
92	10.0.106.91/32	10.0.106.91 – 10.0.106.91	10.0.106.91
93	10.0.106.92/32	10.0.106.92 – 10.0.106.92	10.0.106.92
94	10.0.106.93/32	10.0.106.93 – 10.0.106.93	10.0.106.93
95	10.0.106.94/32	10.0.106.94 – 10.0.106.94	10.0.106.94
96	10.0.106.95/32	10.0.106.95 – 10.0.106.95	10.0.106.95
97	10.0.106.96/32	10.0.106.96 – 10.0.106.96	10.0.106.96
98	10.0.106.97/32	10.0.106.97 – 10.0.106.97	10.0.106.97
99	10.0.106.98/32	10.0.106.98 – 10.0.106.98	10.0.106.98
100	10.0.106.99/32	10.0.106.99 – 10.0.106.99	10.0.106.99
101	10.0.106.100/32	10.0.106.100 – 10.0.106.100	10.0.106.100
102	10.0.106.101/32	10.0.106.101 – 10.0.106.101	10.0.106.101
103	10.0.106.102/32	10.0.106.102 – 10.0.106.102	10.0.106.102
104	10.0.106.103/32	10.0.106.103 – 10.0.106.103	10.0.106.103
105	10.0.106.104/32	10.0.106.104 – 10.0.106.104	10.0.106.104
106	10.0.106.105/32	10.0.106.105 – 10.0.106.105	10.0.106.105
107	10.0.106.106/32	10.0.106.106 – 10.0.106.106	10.0.106.106
108	10.0.106.107/32	10.0.106.107 – 10.0.106.107	10.0.106.107
109	10.0.106.108/32	10.0.106.108 – 10.0.106.108	10.0.106.108
110	10.0.106.109/32	10.0.106.109 – 10.0.106.109	10.0.106.109
111	10.0.106.110/32	10.0.106.110 – 10.0.106.110	10.0.106.110
112	10.0.106.111/32	10.0.106.111 – 10.0.106.111	10.0.106.111
113	10.0.106.112/32	10.0.106.112 – 10.0.106.112	10.0.106.112
114	10.0.106.113/32	10.0.106.113 – 10.0.106.113	10.0.106.113
115	10.0.106.114/32	10.0.106.114 – 10.0.106.114	10.0.106.114
116	10.0.106.115/32	10.0.106.115 – 10.0.106.115	10.0.106.115
117	10.0.106.116/32	10.0.106.116 – 10.0.106.116	10.0.106.116
118	10.0.106.117/32	10.0.106.117 – 10.0.106.117	10.0.106.117
119	10.0.106.118/32	10.0.106.118 – 10.0.106.118	10.0.106.118
120	10.0.106.119/32	10.0.106.119 – 10.0.106.119	10.0.106.119
121	10.0.106.120/32	10.0.106.120 – 10.0.106.120	10.0.106.120
122	10.0.106.121/32	10.0.106.121 – 10.0.106.121	10.0.106.121
123	10.0.106.122/32	10.0.106.122 – 10.0.106.122	10.0.106.122
124	10.0.106.123/32	10.0.106.123 – 10.0.106.123	10.0.106.123
125	10.0.106.124/32	10.0.106.124 – 10.0.106.124	10.0.106.124
126	10.0.106.125/32	10.0.106.125 – 10.0.106.125	10.0.106.125
127	10.0.106.126/32	10.0.106.126 – 10.0.106.126	10.0.106.126
128	10.0.106.127/32	10.0.106.127 – 10.0.106.127	10.0.106.127

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 →