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)10.167.168.0/25

network10.167.168.0/25

broadcast10.167.168.127

first host10.167.168.1

last host10.167.168.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.168.0/25

address00001010.10100111.10101000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10101000.00000000

broadcast00001010.10100111.10101000.01111111

green = network part, grey = host part

hex0x0aa7a800

decimal178759680

reverse dns0.168.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:a800

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.168.0/32	10.167.168.0 – 10.167.168.0	10.167.168.0
2	10.167.168.1/32	10.167.168.1 – 10.167.168.1	10.167.168.1
3	10.167.168.2/32	10.167.168.2 – 10.167.168.2	10.167.168.2
4	10.167.168.3/32	10.167.168.3 – 10.167.168.3	10.167.168.3
5	10.167.168.4/32	10.167.168.4 – 10.167.168.4	10.167.168.4
6	10.167.168.5/32	10.167.168.5 – 10.167.168.5	10.167.168.5
7	10.167.168.6/32	10.167.168.6 – 10.167.168.6	10.167.168.6
8	10.167.168.7/32	10.167.168.7 – 10.167.168.7	10.167.168.7
9	10.167.168.8/32	10.167.168.8 – 10.167.168.8	10.167.168.8
10	10.167.168.9/32	10.167.168.9 – 10.167.168.9	10.167.168.9
11	10.167.168.10/32	10.167.168.10 – 10.167.168.10	10.167.168.10
12	10.167.168.11/32	10.167.168.11 – 10.167.168.11	10.167.168.11
13	10.167.168.12/32	10.167.168.12 – 10.167.168.12	10.167.168.12
14	10.167.168.13/32	10.167.168.13 – 10.167.168.13	10.167.168.13
15	10.167.168.14/32	10.167.168.14 – 10.167.168.14	10.167.168.14
16	10.167.168.15/32	10.167.168.15 – 10.167.168.15	10.167.168.15
17	10.167.168.16/32	10.167.168.16 – 10.167.168.16	10.167.168.16
18	10.167.168.17/32	10.167.168.17 – 10.167.168.17	10.167.168.17
19	10.167.168.18/32	10.167.168.18 – 10.167.168.18	10.167.168.18
20	10.167.168.19/32	10.167.168.19 – 10.167.168.19	10.167.168.19
21	10.167.168.20/32	10.167.168.20 – 10.167.168.20	10.167.168.20
22	10.167.168.21/32	10.167.168.21 – 10.167.168.21	10.167.168.21
23	10.167.168.22/32	10.167.168.22 – 10.167.168.22	10.167.168.22
24	10.167.168.23/32	10.167.168.23 – 10.167.168.23	10.167.168.23
25	10.167.168.24/32	10.167.168.24 – 10.167.168.24	10.167.168.24
26	10.167.168.25/32	10.167.168.25 – 10.167.168.25	10.167.168.25
27	10.167.168.26/32	10.167.168.26 – 10.167.168.26	10.167.168.26
28	10.167.168.27/32	10.167.168.27 – 10.167.168.27	10.167.168.27
29	10.167.168.28/32	10.167.168.28 – 10.167.168.28	10.167.168.28
30	10.167.168.29/32	10.167.168.29 – 10.167.168.29	10.167.168.29
31	10.167.168.30/32	10.167.168.30 – 10.167.168.30	10.167.168.30
32	10.167.168.31/32	10.167.168.31 – 10.167.168.31	10.167.168.31
33	10.167.168.32/32	10.167.168.32 – 10.167.168.32	10.167.168.32
34	10.167.168.33/32	10.167.168.33 – 10.167.168.33	10.167.168.33
35	10.167.168.34/32	10.167.168.34 – 10.167.168.34	10.167.168.34
36	10.167.168.35/32	10.167.168.35 – 10.167.168.35	10.167.168.35
37	10.167.168.36/32	10.167.168.36 – 10.167.168.36	10.167.168.36
38	10.167.168.37/32	10.167.168.37 – 10.167.168.37	10.167.168.37
39	10.167.168.38/32	10.167.168.38 – 10.167.168.38	10.167.168.38
40	10.167.168.39/32	10.167.168.39 – 10.167.168.39	10.167.168.39
41	10.167.168.40/32	10.167.168.40 – 10.167.168.40	10.167.168.40
42	10.167.168.41/32	10.167.168.41 – 10.167.168.41	10.167.168.41
43	10.167.168.42/32	10.167.168.42 – 10.167.168.42	10.167.168.42
44	10.167.168.43/32	10.167.168.43 – 10.167.168.43	10.167.168.43
45	10.167.168.44/32	10.167.168.44 – 10.167.168.44	10.167.168.44
46	10.167.168.45/32	10.167.168.45 – 10.167.168.45	10.167.168.45
47	10.167.168.46/32	10.167.168.46 – 10.167.168.46	10.167.168.46
48	10.167.168.47/32	10.167.168.47 – 10.167.168.47	10.167.168.47
49	10.167.168.48/32	10.167.168.48 – 10.167.168.48	10.167.168.48
50	10.167.168.49/32	10.167.168.49 – 10.167.168.49	10.167.168.49
51	10.167.168.50/32	10.167.168.50 – 10.167.168.50	10.167.168.50
52	10.167.168.51/32	10.167.168.51 – 10.167.168.51	10.167.168.51
53	10.167.168.52/32	10.167.168.52 – 10.167.168.52	10.167.168.52
54	10.167.168.53/32	10.167.168.53 – 10.167.168.53	10.167.168.53
55	10.167.168.54/32	10.167.168.54 – 10.167.168.54	10.167.168.54
56	10.167.168.55/32	10.167.168.55 – 10.167.168.55	10.167.168.55
57	10.167.168.56/32	10.167.168.56 – 10.167.168.56	10.167.168.56
58	10.167.168.57/32	10.167.168.57 – 10.167.168.57	10.167.168.57
59	10.167.168.58/32	10.167.168.58 – 10.167.168.58	10.167.168.58
60	10.167.168.59/32	10.167.168.59 – 10.167.168.59	10.167.168.59
61	10.167.168.60/32	10.167.168.60 – 10.167.168.60	10.167.168.60
62	10.167.168.61/32	10.167.168.61 – 10.167.168.61	10.167.168.61
63	10.167.168.62/32	10.167.168.62 – 10.167.168.62	10.167.168.62
64	10.167.168.63/32	10.167.168.63 – 10.167.168.63	10.167.168.63
65	10.167.168.64/32	10.167.168.64 – 10.167.168.64	10.167.168.64
66	10.167.168.65/32	10.167.168.65 – 10.167.168.65	10.167.168.65
67	10.167.168.66/32	10.167.168.66 – 10.167.168.66	10.167.168.66
68	10.167.168.67/32	10.167.168.67 – 10.167.168.67	10.167.168.67
69	10.167.168.68/32	10.167.168.68 – 10.167.168.68	10.167.168.68
70	10.167.168.69/32	10.167.168.69 – 10.167.168.69	10.167.168.69
71	10.167.168.70/32	10.167.168.70 – 10.167.168.70	10.167.168.70
72	10.167.168.71/32	10.167.168.71 – 10.167.168.71	10.167.168.71
73	10.167.168.72/32	10.167.168.72 – 10.167.168.72	10.167.168.72
74	10.167.168.73/32	10.167.168.73 – 10.167.168.73	10.167.168.73
75	10.167.168.74/32	10.167.168.74 – 10.167.168.74	10.167.168.74
76	10.167.168.75/32	10.167.168.75 – 10.167.168.75	10.167.168.75
77	10.167.168.76/32	10.167.168.76 – 10.167.168.76	10.167.168.76
78	10.167.168.77/32	10.167.168.77 – 10.167.168.77	10.167.168.77
79	10.167.168.78/32	10.167.168.78 – 10.167.168.78	10.167.168.78
80	10.167.168.79/32	10.167.168.79 – 10.167.168.79	10.167.168.79
81	10.167.168.80/32	10.167.168.80 – 10.167.168.80	10.167.168.80
82	10.167.168.81/32	10.167.168.81 – 10.167.168.81	10.167.168.81
83	10.167.168.82/32	10.167.168.82 – 10.167.168.82	10.167.168.82
84	10.167.168.83/32	10.167.168.83 – 10.167.168.83	10.167.168.83
85	10.167.168.84/32	10.167.168.84 – 10.167.168.84	10.167.168.84
86	10.167.168.85/32	10.167.168.85 – 10.167.168.85	10.167.168.85
87	10.167.168.86/32	10.167.168.86 – 10.167.168.86	10.167.168.86
88	10.167.168.87/32	10.167.168.87 – 10.167.168.87	10.167.168.87
89	10.167.168.88/32	10.167.168.88 – 10.167.168.88	10.167.168.88
90	10.167.168.89/32	10.167.168.89 – 10.167.168.89	10.167.168.89
91	10.167.168.90/32	10.167.168.90 – 10.167.168.90	10.167.168.90
92	10.167.168.91/32	10.167.168.91 – 10.167.168.91	10.167.168.91
93	10.167.168.92/32	10.167.168.92 – 10.167.168.92	10.167.168.92
94	10.167.168.93/32	10.167.168.93 – 10.167.168.93	10.167.168.93
95	10.167.168.94/32	10.167.168.94 – 10.167.168.94	10.167.168.94
96	10.167.168.95/32	10.167.168.95 – 10.167.168.95	10.167.168.95
97	10.167.168.96/32	10.167.168.96 – 10.167.168.96	10.167.168.96
98	10.167.168.97/32	10.167.168.97 – 10.167.168.97	10.167.168.97
99	10.167.168.98/32	10.167.168.98 – 10.167.168.98	10.167.168.98
100	10.167.168.99/32	10.167.168.99 – 10.167.168.99	10.167.168.99
101	10.167.168.100/32	10.167.168.100 – 10.167.168.100	10.167.168.100
102	10.167.168.101/32	10.167.168.101 – 10.167.168.101	10.167.168.101
103	10.167.168.102/32	10.167.168.102 – 10.167.168.102	10.167.168.102
104	10.167.168.103/32	10.167.168.103 – 10.167.168.103	10.167.168.103
105	10.167.168.104/32	10.167.168.104 – 10.167.168.104	10.167.168.104
106	10.167.168.105/32	10.167.168.105 – 10.167.168.105	10.167.168.105
107	10.167.168.106/32	10.167.168.106 – 10.167.168.106	10.167.168.106
108	10.167.168.107/32	10.167.168.107 – 10.167.168.107	10.167.168.107
109	10.167.168.108/32	10.167.168.108 – 10.167.168.108	10.167.168.108
110	10.167.168.109/32	10.167.168.109 – 10.167.168.109	10.167.168.109
111	10.167.168.110/32	10.167.168.110 – 10.167.168.110	10.167.168.110
112	10.167.168.111/32	10.167.168.111 – 10.167.168.111	10.167.168.111
113	10.167.168.112/32	10.167.168.112 – 10.167.168.112	10.167.168.112
114	10.167.168.113/32	10.167.168.113 – 10.167.168.113	10.167.168.113
115	10.167.168.114/32	10.167.168.114 – 10.167.168.114	10.167.168.114
116	10.167.168.115/32	10.167.168.115 – 10.167.168.115	10.167.168.115
117	10.167.168.116/32	10.167.168.116 – 10.167.168.116	10.167.168.116
118	10.167.168.117/32	10.167.168.117 – 10.167.168.117	10.167.168.117
119	10.167.168.118/32	10.167.168.118 – 10.167.168.118	10.167.168.118
120	10.167.168.119/32	10.167.168.119 – 10.167.168.119	10.167.168.119
121	10.167.168.120/32	10.167.168.120 – 10.167.168.120	10.167.168.120
122	10.167.168.121/32	10.167.168.121 – 10.167.168.121	10.167.168.121
123	10.167.168.122/32	10.167.168.122 – 10.167.168.122	10.167.168.122
124	10.167.168.123/32	10.167.168.123 – 10.167.168.123	10.167.168.123
125	10.167.168.124/32	10.167.168.124 – 10.167.168.124	10.167.168.124
126	10.167.168.125/32	10.167.168.125 – 10.167.168.125	10.167.168.125
127	10.167.168.126/32	10.167.168.126 – 10.167.168.126	10.167.168.126
128	10.167.168.127/32	10.167.168.127 – 10.167.168.127	10.167.168.127

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 →