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)10.167.105.0/25

network10.167.105.0/25

broadcast10.167.105.127

first host10.167.105.1

last host10.167.105.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.105.0/25

address00001010.10100111.01101001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01101001.00000000

broadcast00001010.10100111.01101001.01111111

green = network part, grey = host part

hex0x0aa76900

decimal178743552

reverse dns0.105.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:6900

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.105.0/32	10.167.105.0 – 10.167.105.0	10.167.105.0
2	10.167.105.1/32	10.167.105.1 – 10.167.105.1	10.167.105.1
3	10.167.105.2/32	10.167.105.2 – 10.167.105.2	10.167.105.2
4	10.167.105.3/32	10.167.105.3 – 10.167.105.3	10.167.105.3
5	10.167.105.4/32	10.167.105.4 – 10.167.105.4	10.167.105.4
6	10.167.105.5/32	10.167.105.5 – 10.167.105.5	10.167.105.5
7	10.167.105.6/32	10.167.105.6 – 10.167.105.6	10.167.105.6
8	10.167.105.7/32	10.167.105.7 – 10.167.105.7	10.167.105.7
9	10.167.105.8/32	10.167.105.8 – 10.167.105.8	10.167.105.8
10	10.167.105.9/32	10.167.105.9 – 10.167.105.9	10.167.105.9
11	10.167.105.10/32	10.167.105.10 – 10.167.105.10	10.167.105.10
12	10.167.105.11/32	10.167.105.11 – 10.167.105.11	10.167.105.11
13	10.167.105.12/32	10.167.105.12 – 10.167.105.12	10.167.105.12
14	10.167.105.13/32	10.167.105.13 – 10.167.105.13	10.167.105.13
15	10.167.105.14/32	10.167.105.14 – 10.167.105.14	10.167.105.14
16	10.167.105.15/32	10.167.105.15 – 10.167.105.15	10.167.105.15
17	10.167.105.16/32	10.167.105.16 – 10.167.105.16	10.167.105.16
18	10.167.105.17/32	10.167.105.17 – 10.167.105.17	10.167.105.17
19	10.167.105.18/32	10.167.105.18 – 10.167.105.18	10.167.105.18
20	10.167.105.19/32	10.167.105.19 – 10.167.105.19	10.167.105.19
21	10.167.105.20/32	10.167.105.20 – 10.167.105.20	10.167.105.20
22	10.167.105.21/32	10.167.105.21 – 10.167.105.21	10.167.105.21
23	10.167.105.22/32	10.167.105.22 – 10.167.105.22	10.167.105.22
24	10.167.105.23/32	10.167.105.23 – 10.167.105.23	10.167.105.23
25	10.167.105.24/32	10.167.105.24 – 10.167.105.24	10.167.105.24
26	10.167.105.25/32	10.167.105.25 – 10.167.105.25	10.167.105.25
27	10.167.105.26/32	10.167.105.26 – 10.167.105.26	10.167.105.26
28	10.167.105.27/32	10.167.105.27 – 10.167.105.27	10.167.105.27
29	10.167.105.28/32	10.167.105.28 – 10.167.105.28	10.167.105.28
30	10.167.105.29/32	10.167.105.29 – 10.167.105.29	10.167.105.29
31	10.167.105.30/32	10.167.105.30 – 10.167.105.30	10.167.105.30
32	10.167.105.31/32	10.167.105.31 – 10.167.105.31	10.167.105.31
33	10.167.105.32/32	10.167.105.32 – 10.167.105.32	10.167.105.32
34	10.167.105.33/32	10.167.105.33 – 10.167.105.33	10.167.105.33
35	10.167.105.34/32	10.167.105.34 – 10.167.105.34	10.167.105.34
36	10.167.105.35/32	10.167.105.35 – 10.167.105.35	10.167.105.35
37	10.167.105.36/32	10.167.105.36 – 10.167.105.36	10.167.105.36
38	10.167.105.37/32	10.167.105.37 – 10.167.105.37	10.167.105.37
39	10.167.105.38/32	10.167.105.38 – 10.167.105.38	10.167.105.38
40	10.167.105.39/32	10.167.105.39 – 10.167.105.39	10.167.105.39
41	10.167.105.40/32	10.167.105.40 – 10.167.105.40	10.167.105.40
42	10.167.105.41/32	10.167.105.41 – 10.167.105.41	10.167.105.41
43	10.167.105.42/32	10.167.105.42 – 10.167.105.42	10.167.105.42
44	10.167.105.43/32	10.167.105.43 – 10.167.105.43	10.167.105.43
45	10.167.105.44/32	10.167.105.44 – 10.167.105.44	10.167.105.44
46	10.167.105.45/32	10.167.105.45 – 10.167.105.45	10.167.105.45
47	10.167.105.46/32	10.167.105.46 – 10.167.105.46	10.167.105.46
48	10.167.105.47/32	10.167.105.47 – 10.167.105.47	10.167.105.47
49	10.167.105.48/32	10.167.105.48 – 10.167.105.48	10.167.105.48
50	10.167.105.49/32	10.167.105.49 – 10.167.105.49	10.167.105.49
51	10.167.105.50/32	10.167.105.50 – 10.167.105.50	10.167.105.50
52	10.167.105.51/32	10.167.105.51 – 10.167.105.51	10.167.105.51
53	10.167.105.52/32	10.167.105.52 – 10.167.105.52	10.167.105.52
54	10.167.105.53/32	10.167.105.53 – 10.167.105.53	10.167.105.53
55	10.167.105.54/32	10.167.105.54 – 10.167.105.54	10.167.105.54
56	10.167.105.55/32	10.167.105.55 – 10.167.105.55	10.167.105.55
57	10.167.105.56/32	10.167.105.56 – 10.167.105.56	10.167.105.56
58	10.167.105.57/32	10.167.105.57 – 10.167.105.57	10.167.105.57
59	10.167.105.58/32	10.167.105.58 – 10.167.105.58	10.167.105.58
60	10.167.105.59/32	10.167.105.59 – 10.167.105.59	10.167.105.59
61	10.167.105.60/32	10.167.105.60 – 10.167.105.60	10.167.105.60
62	10.167.105.61/32	10.167.105.61 – 10.167.105.61	10.167.105.61
63	10.167.105.62/32	10.167.105.62 – 10.167.105.62	10.167.105.62
64	10.167.105.63/32	10.167.105.63 – 10.167.105.63	10.167.105.63
65	10.167.105.64/32	10.167.105.64 – 10.167.105.64	10.167.105.64
66	10.167.105.65/32	10.167.105.65 – 10.167.105.65	10.167.105.65
67	10.167.105.66/32	10.167.105.66 – 10.167.105.66	10.167.105.66
68	10.167.105.67/32	10.167.105.67 – 10.167.105.67	10.167.105.67
69	10.167.105.68/32	10.167.105.68 – 10.167.105.68	10.167.105.68
70	10.167.105.69/32	10.167.105.69 – 10.167.105.69	10.167.105.69
71	10.167.105.70/32	10.167.105.70 – 10.167.105.70	10.167.105.70
72	10.167.105.71/32	10.167.105.71 – 10.167.105.71	10.167.105.71
73	10.167.105.72/32	10.167.105.72 – 10.167.105.72	10.167.105.72
74	10.167.105.73/32	10.167.105.73 – 10.167.105.73	10.167.105.73
75	10.167.105.74/32	10.167.105.74 – 10.167.105.74	10.167.105.74
76	10.167.105.75/32	10.167.105.75 – 10.167.105.75	10.167.105.75
77	10.167.105.76/32	10.167.105.76 – 10.167.105.76	10.167.105.76
78	10.167.105.77/32	10.167.105.77 – 10.167.105.77	10.167.105.77
79	10.167.105.78/32	10.167.105.78 – 10.167.105.78	10.167.105.78
80	10.167.105.79/32	10.167.105.79 – 10.167.105.79	10.167.105.79
81	10.167.105.80/32	10.167.105.80 – 10.167.105.80	10.167.105.80
82	10.167.105.81/32	10.167.105.81 – 10.167.105.81	10.167.105.81
83	10.167.105.82/32	10.167.105.82 – 10.167.105.82	10.167.105.82
84	10.167.105.83/32	10.167.105.83 – 10.167.105.83	10.167.105.83
85	10.167.105.84/32	10.167.105.84 – 10.167.105.84	10.167.105.84
86	10.167.105.85/32	10.167.105.85 – 10.167.105.85	10.167.105.85
87	10.167.105.86/32	10.167.105.86 – 10.167.105.86	10.167.105.86
88	10.167.105.87/32	10.167.105.87 – 10.167.105.87	10.167.105.87
89	10.167.105.88/32	10.167.105.88 – 10.167.105.88	10.167.105.88
90	10.167.105.89/32	10.167.105.89 – 10.167.105.89	10.167.105.89
91	10.167.105.90/32	10.167.105.90 – 10.167.105.90	10.167.105.90
92	10.167.105.91/32	10.167.105.91 – 10.167.105.91	10.167.105.91
93	10.167.105.92/32	10.167.105.92 – 10.167.105.92	10.167.105.92
94	10.167.105.93/32	10.167.105.93 – 10.167.105.93	10.167.105.93
95	10.167.105.94/32	10.167.105.94 – 10.167.105.94	10.167.105.94
96	10.167.105.95/32	10.167.105.95 – 10.167.105.95	10.167.105.95
97	10.167.105.96/32	10.167.105.96 – 10.167.105.96	10.167.105.96
98	10.167.105.97/32	10.167.105.97 – 10.167.105.97	10.167.105.97
99	10.167.105.98/32	10.167.105.98 – 10.167.105.98	10.167.105.98
100	10.167.105.99/32	10.167.105.99 – 10.167.105.99	10.167.105.99
101	10.167.105.100/32	10.167.105.100 – 10.167.105.100	10.167.105.100
102	10.167.105.101/32	10.167.105.101 – 10.167.105.101	10.167.105.101
103	10.167.105.102/32	10.167.105.102 – 10.167.105.102	10.167.105.102
104	10.167.105.103/32	10.167.105.103 – 10.167.105.103	10.167.105.103
105	10.167.105.104/32	10.167.105.104 – 10.167.105.104	10.167.105.104
106	10.167.105.105/32	10.167.105.105 – 10.167.105.105	10.167.105.105
107	10.167.105.106/32	10.167.105.106 – 10.167.105.106	10.167.105.106
108	10.167.105.107/32	10.167.105.107 – 10.167.105.107	10.167.105.107
109	10.167.105.108/32	10.167.105.108 – 10.167.105.108	10.167.105.108
110	10.167.105.109/32	10.167.105.109 – 10.167.105.109	10.167.105.109
111	10.167.105.110/32	10.167.105.110 – 10.167.105.110	10.167.105.110
112	10.167.105.111/32	10.167.105.111 – 10.167.105.111	10.167.105.111
113	10.167.105.112/32	10.167.105.112 – 10.167.105.112	10.167.105.112
114	10.167.105.113/32	10.167.105.113 – 10.167.105.113	10.167.105.113
115	10.167.105.114/32	10.167.105.114 – 10.167.105.114	10.167.105.114
116	10.167.105.115/32	10.167.105.115 – 10.167.105.115	10.167.105.115
117	10.167.105.116/32	10.167.105.116 – 10.167.105.116	10.167.105.116
118	10.167.105.117/32	10.167.105.117 – 10.167.105.117	10.167.105.117
119	10.167.105.118/32	10.167.105.118 – 10.167.105.118	10.167.105.118
120	10.167.105.119/32	10.167.105.119 – 10.167.105.119	10.167.105.119
121	10.167.105.120/32	10.167.105.120 – 10.167.105.120	10.167.105.120
122	10.167.105.121/32	10.167.105.121 – 10.167.105.121	10.167.105.121
123	10.167.105.122/32	10.167.105.122 – 10.167.105.122	10.167.105.122
124	10.167.105.123/32	10.167.105.123 – 10.167.105.123	10.167.105.123
125	10.167.105.124/32	10.167.105.124 – 10.167.105.124	10.167.105.124
126	10.167.105.125/32	10.167.105.125 – 10.167.105.125	10.167.105.125
127	10.167.105.126/32	10.167.105.126 – 10.167.105.126	10.167.105.126
128	10.167.105.127/32	10.167.105.127 – 10.167.105.127	10.167.105.127

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 →