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)10.0.167.0/25

network10.0.167.0/25

broadcast10.0.167.127

first host10.0.167.1

last host10.0.167.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.167.0/25

address00001010.00000000.10100111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.10100111.00000000

broadcast00001010.00000000.10100111.01111111

green = network part, grey = host part

hex0x0a00a700

decimal167814912

reverse dns0.167.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:a700

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.167.0/32	10.0.167.0 – 10.0.167.0	10.0.167.0
2	10.0.167.1/32	10.0.167.1 – 10.0.167.1	10.0.167.1
3	10.0.167.2/32	10.0.167.2 – 10.0.167.2	10.0.167.2
4	10.0.167.3/32	10.0.167.3 – 10.0.167.3	10.0.167.3
5	10.0.167.4/32	10.0.167.4 – 10.0.167.4	10.0.167.4
6	10.0.167.5/32	10.0.167.5 – 10.0.167.5	10.0.167.5
7	10.0.167.6/32	10.0.167.6 – 10.0.167.6	10.0.167.6
8	10.0.167.7/32	10.0.167.7 – 10.0.167.7	10.0.167.7
9	10.0.167.8/32	10.0.167.8 – 10.0.167.8	10.0.167.8
10	10.0.167.9/32	10.0.167.9 – 10.0.167.9	10.0.167.9
11	10.0.167.10/32	10.0.167.10 – 10.0.167.10	10.0.167.10
12	10.0.167.11/32	10.0.167.11 – 10.0.167.11	10.0.167.11
13	10.0.167.12/32	10.0.167.12 – 10.0.167.12	10.0.167.12
14	10.0.167.13/32	10.0.167.13 – 10.0.167.13	10.0.167.13
15	10.0.167.14/32	10.0.167.14 – 10.0.167.14	10.0.167.14
16	10.0.167.15/32	10.0.167.15 – 10.0.167.15	10.0.167.15
17	10.0.167.16/32	10.0.167.16 – 10.0.167.16	10.0.167.16
18	10.0.167.17/32	10.0.167.17 – 10.0.167.17	10.0.167.17
19	10.0.167.18/32	10.0.167.18 – 10.0.167.18	10.0.167.18
20	10.0.167.19/32	10.0.167.19 – 10.0.167.19	10.0.167.19
21	10.0.167.20/32	10.0.167.20 – 10.0.167.20	10.0.167.20
22	10.0.167.21/32	10.0.167.21 – 10.0.167.21	10.0.167.21
23	10.0.167.22/32	10.0.167.22 – 10.0.167.22	10.0.167.22
24	10.0.167.23/32	10.0.167.23 – 10.0.167.23	10.0.167.23
25	10.0.167.24/32	10.0.167.24 – 10.0.167.24	10.0.167.24
26	10.0.167.25/32	10.0.167.25 – 10.0.167.25	10.0.167.25
27	10.0.167.26/32	10.0.167.26 – 10.0.167.26	10.0.167.26
28	10.0.167.27/32	10.0.167.27 – 10.0.167.27	10.0.167.27
29	10.0.167.28/32	10.0.167.28 – 10.0.167.28	10.0.167.28
30	10.0.167.29/32	10.0.167.29 – 10.0.167.29	10.0.167.29
31	10.0.167.30/32	10.0.167.30 – 10.0.167.30	10.0.167.30
32	10.0.167.31/32	10.0.167.31 – 10.0.167.31	10.0.167.31
33	10.0.167.32/32	10.0.167.32 – 10.0.167.32	10.0.167.32
34	10.0.167.33/32	10.0.167.33 – 10.0.167.33	10.0.167.33
35	10.0.167.34/32	10.0.167.34 – 10.0.167.34	10.0.167.34
36	10.0.167.35/32	10.0.167.35 – 10.0.167.35	10.0.167.35
37	10.0.167.36/32	10.0.167.36 – 10.0.167.36	10.0.167.36
38	10.0.167.37/32	10.0.167.37 – 10.0.167.37	10.0.167.37
39	10.0.167.38/32	10.0.167.38 – 10.0.167.38	10.0.167.38
40	10.0.167.39/32	10.0.167.39 – 10.0.167.39	10.0.167.39
41	10.0.167.40/32	10.0.167.40 – 10.0.167.40	10.0.167.40
42	10.0.167.41/32	10.0.167.41 – 10.0.167.41	10.0.167.41
43	10.0.167.42/32	10.0.167.42 – 10.0.167.42	10.0.167.42
44	10.0.167.43/32	10.0.167.43 – 10.0.167.43	10.0.167.43
45	10.0.167.44/32	10.0.167.44 – 10.0.167.44	10.0.167.44
46	10.0.167.45/32	10.0.167.45 – 10.0.167.45	10.0.167.45
47	10.0.167.46/32	10.0.167.46 – 10.0.167.46	10.0.167.46
48	10.0.167.47/32	10.0.167.47 – 10.0.167.47	10.0.167.47
49	10.0.167.48/32	10.0.167.48 – 10.0.167.48	10.0.167.48
50	10.0.167.49/32	10.0.167.49 – 10.0.167.49	10.0.167.49
51	10.0.167.50/32	10.0.167.50 – 10.0.167.50	10.0.167.50
52	10.0.167.51/32	10.0.167.51 – 10.0.167.51	10.0.167.51
53	10.0.167.52/32	10.0.167.52 – 10.0.167.52	10.0.167.52
54	10.0.167.53/32	10.0.167.53 – 10.0.167.53	10.0.167.53
55	10.0.167.54/32	10.0.167.54 – 10.0.167.54	10.0.167.54
56	10.0.167.55/32	10.0.167.55 – 10.0.167.55	10.0.167.55
57	10.0.167.56/32	10.0.167.56 – 10.0.167.56	10.0.167.56
58	10.0.167.57/32	10.0.167.57 – 10.0.167.57	10.0.167.57
59	10.0.167.58/32	10.0.167.58 – 10.0.167.58	10.0.167.58
60	10.0.167.59/32	10.0.167.59 – 10.0.167.59	10.0.167.59
61	10.0.167.60/32	10.0.167.60 – 10.0.167.60	10.0.167.60
62	10.0.167.61/32	10.0.167.61 – 10.0.167.61	10.0.167.61
63	10.0.167.62/32	10.0.167.62 – 10.0.167.62	10.0.167.62
64	10.0.167.63/32	10.0.167.63 – 10.0.167.63	10.0.167.63
65	10.0.167.64/32	10.0.167.64 – 10.0.167.64	10.0.167.64
66	10.0.167.65/32	10.0.167.65 – 10.0.167.65	10.0.167.65
67	10.0.167.66/32	10.0.167.66 – 10.0.167.66	10.0.167.66
68	10.0.167.67/32	10.0.167.67 – 10.0.167.67	10.0.167.67
69	10.0.167.68/32	10.0.167.68 – 10.0.167.68	10.0.167.68
70	10.0.167.69/32	10.0.167.69 – 10.0.167.69	10.0.167.69
71	10.0.167.70/32	10.0.167.70 – 10.0.167.70	10.0.167.70
72	10.0.167.71/32	10.0.167.71 – 10.0.167.71	10.0.167.71
73	10.0.167.72/32	10.0.167.72 – 10.0.167.72	10.0.167.72
74	10.0.167.73/32	10.0.167.73 – 10.0.167.73	10.0.167.73
75	10.0.167.74/32	10.0.167.74 – 10.0.167.74	10.0.167.74
76	10.0.167.75/32	10.0.167.75 – 10.0.167.75	10.0.167.75
77	10.0.167.76/32	10.0.167.76 – 10.0.167.76	10.0.167.76
78	10.0.167.77/32	10.0.167.77 – 10.0.167.77	10.0.167.77
79	10.0.167.78/32	10.0.167.78 – 10.0.167.78	10.0.167.78
80	10.0.167.79/32	10.0.167.79 – 10.0.167.79	10.0.167.79
81	10.0.167.80/32	10.0.167.80 – 10.0.167.80	10.0.167.80
82	10.0.167.81/32	10.0.167.81 – 10.0.167.81	10.0.167.81
83	10.0.167.82/32	10.0.167.82 – 10.0.167.82	10.0.167.82
84	10.0.167.83/32	10.0.167.83 – 10.0.167.83	10.0.167.83
85	10.0.167.84/32	10.0.167.84 – 10.0.167.84	10.0.167.84
86	10.0.167.85/32	10.0.167.85 – 10.0.167.85	10.0.167.85
87	10.0.167.86/32	10.0.167.86 – 10.0.167.86	10.0.167.86
88	10.0.167.87/32	10.0.167.87 – 10.0.167.87	10.0.167.87
89	10.0.167.88/32	10.0.167.88 – 10.0.167.88	10.0.167.88
90	10.0.167.89/32	10.0.167.89 – 10.0.167.89	10.0.167.89
91	10.0.167.90/32	10.0.167.90 – 10.0.167.90	10.0.167.90
92	10.0.167.91/32	10.0.167.91 – 10.0.167.91	10.0.167.91
93	10.0.167.92/32	10.0.167.92 – 10.0.167.92	10.0.167.92
94	10.0.167.93/32	10.0.167.93 – 10.0.167.93	10.0.167.93
95	10.0.167.94/32	10.0.167.94 – 10.0.167.94	10.0.167.94
96	10.0.167.95/32	10.0.167.95 – 10.0.167.95	10.0.167.95
97	10.0.167.96/32	10.0.167.96 – 10.0.167.96	10.0.167.96
98	10.0.167.97/32	10.0.167.97 – 10.0.167.97	10.0.167.97
99	10.0.167.98/32	10.0.167.98 – 10.0.167.98	10.0.167.98
100	10.0.167.99/32	10.0.167.99 – 10.0.167.99	10.0.167.99
101	10.0.167.100/32	10.0.167.100 – 10.0.167.100	10.0.167.100
102	10.0.167.101/32	10.0.167.101 – 10.0.167.101	10.0.167.101
103	10.0.167.102/32	10.0.167.102 – 10.0.167.102	10.0.167.102
104	10.0.167.103/32	10.0.167.103 – 10.0.167.103	10.0.167.103
105	10.0.167.104/32	10.0.167.104 – 10.0.167.104	10.0.167.104
106	10.0.167.105/32	10.0.167.105 – 10.0.167.105	10.0.167.105
107	10.0.167.106/32	10.0.167.106 – 10.0.167.106	10.0.167.106
108	10.0.167.107/32	10.0.167.107 – 10.0.167.107	10.0.167.107
109	10.0.167.108/32	10.0.167.108 – 10.0.167.108	10.0.167.108
110	10.0.167.109/32	10.0.167.109 – 10.0.167.109	10.0.167.109
111	10.0.167.110/32	10.0.167.110 – 10.0.167.110	10.0.167.110
112	10.0.167.111/32	10.0.167.111 – 10.0.167.111	10.0.167.111
113	10.0.167.112/32	10.0.167.112 – 10.0.167.112	10.0.167.112
114	10.0.167.113/32	10.0.167.113 – 10.0.167.113	10.0.167.113
115	10.0.167.114/32	10.0.167.114 – 10.0.167.114	10.0.167.114
116	10.0.167.115/32	10.0.167.115 – 10.0.167.115	10.0.167.115
117	10.0.167.116/32	10.0.167.116 – 10.0.167.116	10.0.167.116
118	10.0.167.117/32	10.0.167.117 – 10.0.167.117	10.0.167.117
119	10.0.167.118/32	10.0.167.118 – 10.0.167.118	10.0.167.118
120	10.0.167.119/32	10.0.167.119 – 10.0.167.119	10.0.167.119
121	10.0.167.120/32	10.0.167.120 – 10.0.167.120	10.0.167.120
122	10.0.167.121/32	10.0.167.121 – 10.0.167.121	10.0.167.121
123	10.0.167.122/32	10.0.167.122 – 10.0.167.122	10.0.167.122
124	10.0.167.123/32	10.0.167.123 – 10.0.167.123	10.0.167.123
125	10.0.167.124/32	10.0.167.124 – 10.0.167.124	10.0.167.124
126	10.0.167.125/32	10.0.167.125 – 10.0.167.125	10.0.167.125
127	10.0.167.126/32	10.0.167.126 – 10.0.167.126	10.0.167.126
128	10.0.167.127/32	10.0.167.127 – 10.0.167.127	10.0.167.127

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 →