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)10.167.140.0/25

network10.167.140.0/25

broadcast10.167.140.127

first host10.167.140.1

last host10.167.140.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.140.0/25

address00001010.10100111.10001100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10001100.00000000

broadcast00001010.10100111.10001100.01111111

green = network part, grey = host part

hex0x0aa78c00

decimal178752512

reverse dns0.140.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8c00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.140.0/32	10.167.140.0 – 10.167.140.0	10.167.140.0
2	10.167.140.1/32	10.167.140.1 – 10.167.140.1	10.167.140.1
3	10.167.140.2/32	10.167.140.2 – 10.167.140.2	10.167.140.2
4	10.167.140.3/32	10.167.140.3 – 10.167.140.3	10.167.140.3
5	10.167.140.4/32	10.167.140.4 – 10.167.140.4	10.167.140.4
6	10.167.140.5/32	10.167.140.5 – 10.167.140.5	10.167.140.5
7	10.167.140.6/32	10.167.140.6 – 10.167.140.6	10.167.140.6
8	10.167.140.7/32	10.167.140.7 – 10.167.140.7	10.167.140.7
9	10.167.140.8/32	10.167.140.8 – 10.167.140.8	10.167.140.8
10	10.167.140.9/32	10.167.140.9 – 10.167.140.9	10.167.140.9
11	10.167.140.10/32	10.167.140.10 – 10.167.140.10	10.167.140.10
12	10.167.140.11/32	10.167.140.11 – 10.167.140.11	10.167.140.11
13	10.167.140.12/32	10.167.140.12 – 10.167.140.12	10.167.140.12
14	10.167.140.13/32	10.167.140.13 – 10.167.140.13	10.167.140.13
15	10.167.140.14/32	10.167.140.14 – 10.167.140.14	10.167.140.14
16	10.167.140.15/32	10.167.140.15 – 10.167.140.15	10.167.140.15
17	10.167.140.16/32	10.167.140.16 – 10.167.140.16	10.167.140.16
18	10.167.140.17/32	10.167.140.17 – 10.167.140.17	10.167.140.17
19	10.167.140.18/32	10.167.140.18 – 10.167.140.18	10.167.140.18
20	10.167.140.19/32	10.167.140.19 – 10.167.140.19	10.167.140.19
21	10.167.140.20/32	10.167.140.20 – 10.167.140.20	10.167.140.20
22	10.167.140.21/32	10.167.140.21 – 10.167.140.21	10.167.140.21
23	10.167.140.22/32	10.167.140.22 – 10.167.140.22	10.167.140.22
24	10.167.140.23/32	10.167.140.23 – 10.167.140.23	10.167.140.23
25	10.167.140.24/32	10.167.140.24 – 10.167.140.24	10.167.140.24
26	10.167.140.25/32	10.167.140.25 – 10.167.140.25	10.167.140.25
27	10.167.140.26/32	10.167.140.26 – 10.167.140.26	10.167.140.26
28	10.167.140.27/32	10.167.140.27 – 10.167.140.27	10.167.140.27
29	10.167.140.28/32	10.167.140.28 – 10.167.140.28	10.167.140.28
30	10.167.140.29/32	10.167.140.29 – 10.167.140.29	10.167.140.29
31	10.167.140.30/32	10.167.140.30 – 10.167.140.30	10.167.140.30
32	10.167.140.31/32	10.167.140.31 – 10.167.140.31	10.167.140.31
33	10.167.140.32/32	10.167.140.32 – 10.167.140.32	10.167.140.32
34	10.167.140.33/32	10.167.140.33 – 10.167.140.33	10.167.140.33
35	10.167.140.34/32	10.167.140.34 – 10.167.140.34	10.167.140.34
36	10.167.140.35/32	10.167.140.35 – 10.167.140.35	10.167.140.35
37	10.167.140.36/32	10.167.140.36 – 10.167.140.36	10.167.140.36
38	10.167.140.37/32	10.167.140.37 – 10.167.140.37	10.167.140.37
39	10.167.140.38/32	10.167.140.38 – 10.167.140.38	10.167.140.38
40	10.167.140.39/32	10.167.140.39 – 10.167.140.39	10.167.140.39
41	10.167.140.40/32	10.167.140.40 – 10.167.140.40	10.167.140.40
42	10.167.140.41/32	10.167.140.41 – 10.167.140.41	10.167.140.41
43	10.167.140.42/32	10.167.140.42 – 10.167.140.42	10.167.140.42
44	10.167.140.43/32	10.167.140.43 – 10.167.140.43	10.167.140.43
45	10.167.140.44/32	10.167.140.44 – 10.167.140.44	10.167.140.44
46	10.167.140.45/32	10.167.140.45 – 10.167.140.45	10.167.140.45
47	10.167.140.46/32	10.167.140.46 – 10.167.140.46	10.167.140.46
48	10.167.140.47/32	10.167.140.47 – 10.167.140.47	10.167.140.47
49	10.167.140.48/32	10.167.140.48 – 10.167.140.48	10.167.140.48
50	10.167.140.49/32	10.167.140.49 – 10.167.140.49	10.167.140.49
51	10.167.140.50/32	10.167.140.50 – 10.167.140.50	10.167.140.50
52	10.167.140.51/32	10.167.140.51 – 10.167.140.51	10.167.140.51
53	10.167.140.52/32	10.167.140.52 – 10.167.140.52	10.167.140.52
54	10.167.140.53/32	10.167.140.53 – 10.167.140.53	10.167.140.53
55	10.167.140.54/32	10.167.140.54 – 10.167.140.54	10.167.140.54
56	10.167.140.55/32	10.167.140.55 – 10.167.140.55	10.167.140.55
57	10.167.140.56/32	10.167.140.56 – 10.167.140.56	10.167.140.56
58	10.167.140.57/32	10.167.140.57 – 10.167.140.57	10.167.140.57
59	10.167.140.58/32	10.167.140.58 – 10.167.140.58	10.167.140.58
60	10.167.140.59/32	10.167.140.59 – 10.167.140.59	10.167.140.59
61	10.167.140.60/32	10.167.140.60 – 10.167.140.60	10.167.140.60
62	10.167.140.61/32	10.167.140.61 – 10.167.140.61	10.167.140.61
63	10.167.140.62/32	10.167.140.62 – 10.167.140.62	10.167.140.62
64	10.167.140.63/32	10.167.140.63 – 10.167.140.63	10.167.140.63
65	10.167.140.64/32	10.167.140.64 – 10.167.140.64	10.167.140.64
66	10.167.140.65/32	10.167.140.65 – 10.167.140.65	10.167.140.65
67	10.167.140.66/32	10.167.140.66 – 10.167.140.66	10.167.140.66
68	10.167.140.67/32	10.167.140.67 – 10.167.140.67	10.167.140.67
69	10.167.140.68/32	10.167.140.68 – 10.167.140.68	10.167.140.68
70	10.167.140.69/32	10.167.140.69 – 10.167.140.69	10.167.140.69
71	10.167.140.70/32	10.167.140.70 – 10.167.140.70	10.167.140.70
72	10.167.140.71/32	10.167.140.71 – 10.167.140.71	10.167.140.71
73	10.167.140.72/32	10.167.140.72 – 10.167.140.72	10.167.140.72
74	10.167.140.73/32	10.167.140.73 – 10.167.140.73	10.167.140.73
75	10.167.140.74/32	10.167.140.74 – 10.167.140.74	10.167.140.74
76	10.167.140.75/32	10.167.140.75 – 10.167.140.75	10.167.140.75
77	10.167.140.76/32	10.167.140.76 – 10.167.140.76	10.167.140.76
78	10.167.140.77/32	10.167.140.77 – 10.167.140.77	10.167.140.77
79	10.167.140.78/32	10.167.140.78 – 10.167.140.78	10.167.140.78
80	10.167.140.79/32	10.167.140.79 – 10.167.140.79	10.167.140.79
81	10.167.140.80/32	10.167.140.80 – 10.167.140.80	10.167.140.80
82	10.167.140.81/32	10.167.140.81 – 10.167.140.81	10.167.140.81
83	10.167.140.82/32	10.167.140.82 – 10.167.140.82	10.167.140.82
84	10.167.140.83/32	10.167.140.83 – 10.167.140.83	10.167.140.83
85	10.167.140.84/32	10.167.140.84 – 10.167.140.84	10.167.140.84
86	10.167.140.85/32	10.167.140.85 – 10.167.140.85	10.167.140.85
87	10.167.140.86/32	10.167.140.86 – 10.167.140.86	10.167.140.86
88	10.167.140.87/32	10.167.140.87 – 10.167.140.87	10.167.140.87
89	10.167.140.88/32	10.167.140.88 – 10.167.140.88	10.167.140.88
90	10.167.140.89/32	10.167.140.89 – 10.167.140.89	10.167.140.89
91	10.167.140.90/32	10.167.140.90 – 10.167.140.90	10.167.140.90
92	10.167.140.91/32	10.167.140.91 – 10.167.140.91	10.167.140.91
93	10.167.140.92/32	10.167.140.92 – 10.167.140.92	10.167.140.92
94	10.167.140.93/32	10.167.140.93 – 10.167.140.93	10.167.140.93
95	10.167.140.94/32	10.167.140.94 – 10.167.140.94	10.167.140.94
96	10.167.140.95/32	10.167.140.95 – 10.167.140.95	10.167.140.95
97	10.167.140.96/32	10.167.140.96 – 10.167.140.96	10.167.140.96
98	10.167.140.97/32	10.167.140.97 – 10.167.140.97	10.167.140.97
99	10.167.140.98/32	10.167.140.98 – 10.167.140.98	10.167.140.98
100	10.167.140.99/32	10.167.140.99 – 10.167.140.99	10.167.140.99
101	10.167.140.100/32	10.167.140.100 – 10.167.140.100	10.167.140.100
102	10.167.140.101/32	10.167.140.101 – 10.167.140.101	10.167.140.101
103	10.167.140.102/32	10.167.140.102 – 10.167.140.102	10.167.140.102
104	10.167.140.103/32	10.167.140.103 – 10.167.140.103	10.167.140.103
105	10.167.140.104/32	10.167.140.104 – 10.167.140.104	10.167.140.104
106	10.167.140.105/32	10.167.140.105 – 10.167.140.105	10.167.140.105
107	10.167.140.106/32	10.167.140.106 – 10.167.140.106	10.167.140.106
108	10.167.140.107/32	10.167.140.107 – 10.167.140.107	10.167.140.107
109	10.167.140.108/32	10.167.140.108 – 10.167.140.108	10.167.140.108
110	10.167.140.109/32	10.167.140.109 – 10.167.140.109	10.167.140.109
111	10.167.140.110/32	10.167.140.110 – 10.167.140.110	10.167.140.110
112	10.167.140.111/32	10.167.140.111 – 10.167.140.111	10.167.140.111
113	10.167.140.112/32	10.167.140.112 – 10.167.140.112	10.167.140.112
114	10.167.140.113/32	10.167.140.113 – 10.167.140.113	10.167.140.113
115	10.167.140.114/32	10.167.140.114 – 10.167.140.114	10.167.140.114
116	10.167.140.115/32	10.167.140.115 – 10.167.140.115	10.167.140.115
117	10.167.140.116/32	10.167.140.116 – 10.167.140.116	10.167.140.116
118	10.167.140.117/32	10.167.140.117 – 10.167.140.117	10.167.140.117
119	10.167.140.118/32	10.167.140.118 – 10.167.140.118	10.167.140.118
120	10.167.140.119/32	10.167.140.119 – 10.167.140.119	10.167.140.119
121	10.167.140.120/32	10.167.140.120 – 10.167.140.120	10.167.140.120
122	10.167.140.121/32	10.167.140.121 – 10.167.140.121	10.167.140.121
123	10.167.140.122/32	10.167.140.122 – 10.167.140.122	10.167.140.122
124	10.167.140.123/32	10.167.140.123 – 10.167.140.123	10.167.140.123
125	10.167.140.124/32	10.167.140.124 – 10.167.140.124	10.167.140.124
126	10.167.140.125/32	10.167.140.125 – 10.167.140.125	10.167.140.125
127	10.167.140.126/32	10.167.140.126 – 10.167.140.126	10.167.140.126
128	10.167.140.127/32	10.167.140.127 – 10.167.140.127	10.167.140.127

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 →