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)10.0.68.0/25

network10.0.68.0/25

broadcast10.0.68.127

first host10.0.68.1

last host10.0.68.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.68.0/25

address00001010.00000000.01000100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01000100.00000000

broadcast00001010.00000000.01000100.01111111

green = network part, grey = host part

hex0x0a004400

decimal167789568

reverse dns0.68.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:4400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.68.0/32	10.0.68.0 – 10.0.68.0	10.0.68.0
2	10.0.68.1/32	10.0.68.1 – 10.0.68.1	10.0.68.1
3	10.0.68.2/32	10.0.68.2 – 10.0.68.2	10.0.68.2
4	10.0.68.3/32	10.0.68.3 – 10.0.68.3	10.0.68.3
5	10.0.68.4/32	10.0.68.4 – 10.0.68.4	10.0.68.4
6	10.0.68.5/32	10.0.68.5 – 10.0.68.5	10.0.68.5
7	10.0.68.6/32	10.0.68.6 – 10.0.68.6	10.0.68.6
8	10.0.68.7/32	10.0.68.7 – 10.0.68.7	10.0.68.7
9	10.0.68.8/32	10.0.68.8 – 10.0.68.8	10.0.68.8
10	10.0.68.9/32	10.0.68.9 – 10.0.68.9	10.0.68.9
11	10.0.68.10/32	10.0.68.10 – 10.0.68.10	10.0.68.10
12	10.0.68.11/32	10.0.68.11 – 10.0.68.11	10.0.68.11
13	10.0.68.12/32	10.0.68.12 – 10.0.68.12	10.0.68.12
14	10.0.68.13/32	10.0.68.13 – 10.0.68.13	10.0.68.13
15	10.0.68.14/32	10.0.68.14 – 10.0.68.14	10.0.68.14
16	10.0.68.15/32	10.0.68.15 – 10.0.68.15	10.0.68.15
17	10.0.68.16/32	10.0.68.16 – 10.0.68.16	10.0.68.16
18	10.0.68.17/32	10.0.68.17 – 10.0.68.17	10.0.68.17
19	10.0.68.18/32	10.0.68.18 – 10.0.68.18	10.0.68.18
20	10.0.68.19/32	10.0.68.19 – 10.0.68.19	10.0.68.19
21	10.0.68.20/32	10.0.68.20 – 10.0.68.20	10.0.68.20
22	10.0.68.21/32	10.0.68.21 – 10.0.68.21	10.0.68.21
23	10.0.68.22/32	10.0.68.22 – 10.0.68.22	10.0.68.22
24	10.0.68.23/32	10.0.68.23 – 10.0.68.23	10.0.68.23
25	10.0.68.24/32	10.0.68.24 – 10.0.68.24	10.0.68.24
26	10.0.68.25/32	10.0.68.25 – 10.0.68.25	10.0.68.25
27	10.0.68.26/32	10.0.68.26 – 10.0.68.26	10.0.68.26
28	10.0.68.27/32	10.0.68.27 – 10.0.68.27	10.0.68.27
29	10.0.68.28/32	10.0.68.28 – 10.0.68.28	10.0.68.28
30	10.0.68.29/32	10.0.68.29 – 10.0.68.29	10.0.68.29
31	10.0.68.30/32	10.0.68.30 – 10.0.68.30	10.0.68.30
32	10.0.68.31/32	10.0.68.31 – 10.0.68.31	10.0.68.31
33	10.0.68.32/32	10.0.68.32 – 10.0.68.32	10.0.68.32
34	10.0.68.33/32	10.0.68.33 – 10.0.68.33	10.0.68.33
35	10.0.68.34/32	10.0.68.34 – 10.0.68.34	10.0.68.34
36	10.0.68.35/32	10.0.68.35 – 10.0.68.35	10.0.68.35
37	10.0.68.36/32	10.0.68.36 – 10.0.68.36	10.0.68.36
38	10.0.68.37/32	10.0.68.37 – 10.0.68.37	10.0.68.37
39	10.0.68.38/32	10.0.68.38 – 10.0.68.38	10.0.68.38
40	10.0.68.39/32	10.0.68.39 – 10.0.68.39	10.0.68.39
41	10.0.68.40/32	10.0.68.40 – 10.0.68.40	10.0.68.40
42	10.0.68.41/32	10.0.68.41 – 10.0.68.41	10.0.68.41
43	10.0.68.42/32	10.0.68.42 – 10.0.68.42	10.0.68.42
44	10.0.68.43/32	10.0.68.43 – 10.0.68.43	10.0.68.43
45	10.0.68.44/32	10.0.68.44 – 10.0.68.44	10.0.68.44
46	10.0.68.45/32	10.0.68.45 – 10.0.68.45	10.0.68.45
47	10.0.68.46/32	10.0.68.46 – 10.0.68.46	10.0.68.46
48	10.0.68.47/32	10.0.68.47 – 10.0.68.47	10.0.68.47
49	10.0.68.48/32	10.0.68.48 – 10.0.68.48	10.0.68.48
50	10.0.68.49/32	10.0.68.49 – 10.0.68.49	10.0.68.49
51	10.0.68.50/32	10.0.68.50 – 10.0.68.50	10.0.68.50
52	10.0.68.51/32	10.0.68.51 – 10.0.68.51	10.0.68.51
53	10.0.68.52/32	10.0.68.52 – 10.0.68.52	10.0.68.52
54	10.0.68.53/32	10.0.68.53 – 10.0.68.53	10.0.68.53
55	10.0.68.54/32	10.0.68.54 – 10.0.68.54	10.0.68.54
56	10.0.68.55/32	10.0.68.55 – 10.0.68.55	10.0.68.55
57	10.0.68.56/32	10.0.68.56 – 10.0.68.56	10.0.68.56
58	10.0.68.57/32	10.0.68.57 – 10.0.68.57	10.0.68.57
59	10.0.68.58/32	10.0.68.58 – 10.0.68.58	10.0.68.58
60	10.0.68.59/32	10.0.68.59 – 10.0.68.59	10.0.68.59
61	10.0.68.60/32	10.0.68.60 – 10.0.68.60	10.0.68.60
62	10.0.68.61/32	10.0.68.61 – 10.0.68.61	10.0.68.61
63	10.0.68.62/32	10.0.68.62 – 10.0.68.62	10.0.68.62
64	10.0.68.63/32	10.0.68.63 – 10.0.68.63	10.0.68.63
65	10.0.68.64/32	10.0.68.64 – 10.0.68.64	10.0.68.64
66	10.0.68.65/32	10.0.68.65 – 10.0.68.65	10.0.68.65
67	10.0.68.66/32	10.0.68.66 – 10.0.68.66	10.0.68.66
68	10.0.68.67/32	10.0.68.67 – 10.0.68.67	10.0.68.67
69	10.0.68.68/32	10.0.68.68 – 10.0.68.68	10.0.68.68
70	10.0.68.69/32	10.0.68.69 – 10.0.68.69	10.0.68.69
71	10.0.68.70/32	10.0.68.70 – 10.0.68.70	10.0.68.70
72	10.0.68.71/32	10.0.68.71 – 10.0.68.71	10.0.68.71
73	10.0.68.72/32	10.0.68.72 – 10.0.68.72	10.0.68.72
74	10.0.68.73/32	10.0.68.73 – 10.0.68.73	10.0.68.73
75	10.0.68.74/32	10.0.68.74 – 10.0.68.74	10.0.68.74
76	10.0.68.75/32	10.0.68.75 – 10.0.68.75	10.0.68.75
77	10.0.68.76/32	10.0.68.76 – 10.0.68.76	10.0.68.76
78	10.0.68.77/32	10.0.68.77 – 10.0.68.77	10.0.68.77
79	10.0.68.78/32	10.0.68.78 – 10.0.68.78	10.0.68.78
80	10.0.68.79/32	10.0.68.79 – 10.0.68.79	10.0.68.79
81	10.0.68.80/32	10.0.68.80 – 10.0.68.80	10.0.68.80
82	10.0.68.81/32	10.0.68.81 – 10.0.68.81	10.0.68.81
83	10.0.68.82/32	10.0.68.82 – 10.0.68.82	10.0.68.82
84	10.0.68.83/32	10.0.68.83 – 10.0.68.83	10.0.68.83
85	10.0.68.84/32	10.0.68.84 – 10.0.68.84	10.0.68.84
86	10.0.68.85/32	10.0.68.85 – 10.0.68.85	10.0.68.85
87	10.0.68.86/32	10.0.68.86 – 10.0.68.86	10.0.68.86
88	10.0.68.87/32	10.0.68.87 – 10.0.68.87	10.0.68.87
89	10.0.68.88/32	10.0.68.88 – 10.0.68.88	10.0.68.88
90	10.0.68.89/32	10.0.68.89 – 10.0.68.89	10.0.68.89
91	10.0.68.90/32	10.0.68.90 – 10.0.68.90	10.0.68.90
92	10.0.68.91/32	10.0.68.91 – 10.0.68.91	10.0.68.91
93	10.0.68.92/32	10.0.68.92 – 10.0.68.92	10.0.68.92
94	10.0.68.93/32	10.0.68.93 – 10.0.68.93	10.0.68.93
95	10.0.68.94/32	10.0.68.94 – 10.0.68.94	10.0.68.94
96	10.0.68.95/32	10.0.68.95 – 10.0.68.95	10.0.68.95
97	10.0.68.96/32	10.0.68.96 – 10.0.68.96	10.0.68.96
98	10.0.68.97/32	10.0.68.97 – 10.0.68.97	10.0.68.97
99	10.0.68.98/32	10.0.68.98 – 10.0.68.98	10.0.68.98
100	10.0.68.99/32	10.0.68.99 – 10.0.68.99	10.0.68.99
101	10.0.68.100/32	10.0.68.100 – 10.0.68.100	10.0.68.100
102	10.0.68.101/32	10.0.68.101 – 10.0.68.101	10.0.68.101
103	10.0.68.102/32	10.0.68.102 – 10.0.68.102	10.0.68.102
104	10.0.68.103/32	10.0.68.103 – 10.0.68.103	10.0.68.103
105	10.0.68.104/32	10.0.68.104 – 10.0.68.104	10.0.68.104
106	10.0.68.105/32	10.0.68.105 – 10.0.68.105	10.0.68.105
107	10.0.68.106/32	10.0.68.106 – 10.0.68.106	10.0.68.106
108	10.0.68.107/32	10.0.68.107 – 10.0.68.107	10.0.68.107
109	10.0.68.108/32	10.0.68.108 – 10.0.68.108	10.0.68.108
110	10.0.68.109/32	10.0.68.109 – 10.0.68.109	10.0.68.109
111	10.0.68.110/32	10.0.68.110 – 10.0.68.110	10.0.68.110
112	10.0.68.111/32	10.0.68.111 – 10.0.68.111	10.0.68.111
113	10.0.68.112/32	10.0.68.112 – 10.0.68.112	10.0.68.112
114	10.0.68.113/32	10.0.68.113 – 10.0.68.113	10.0.68.113
115	10.0.68.114/32	10.0.68.114 – 10.0.68.114	10.0.68.114
116	10.0.68.115/32	10.0.68.115 – 10.0.68.115	10.0.68.115
117	10.0.68.116/32	10.0.68.116 – 10.0.68.116	10.0.68.116
118	10.0.68.117/32	10.0.68.117 – 10.0.68.117	10.0.68.117
119	10.0.68.118/32	10.0.68.118 – 10.0.68.118	10.0.68.118
120	10.0.68.119/32	10.0.68.119 – 10.0.68.119	10.0.68.119
121	10.0.68.120/32	10.0.68.120 – 10.0.68.120	10.0.68.120
122	10.0.68.121/32	10.0.68.121 – 10.0.68.121	10.0.68.121
123	10.0.68.122/32	10.0.68.122 – 10.0.68.122	10.0.68.122
124	10.0.68.123/32	10.0.68.123 – 10.0.68.123	10.0.68.123
125	10.0.68.124/32	10.0.68.124 – 10.0.68.124	10.0.68.124
126	10.0.68.125/32	10.0.68.125 – 10.0.68.125	10.0.68.125
127	10.0.68.126/32	10.0.68.126 – 10.0.68.126	10.0.68.126
128	10.0.68.127/32	10.0.68.127 – 10.0.68.127	10.0.68.127

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 →