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)10.167.126.0/25

network10.167.126.0/25

broadcast10.167.126.127

first host10.167.126.1

last host10.167.126.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.126.0/25

address00001010.10100111.01111110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01111110.00000000

broadcast00001010.10100111.01111110.01111111

green = network part, grey = host part

hex0x0aa77e00

decimal178748928

reverse dns0.126.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:7e00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.126.0/32	10.167.126.0 – 10.167.126.0	10.167.126.0
2	10.167.126.1/32	10.167.126.1 – 10.167.126.1	10.167.126.1
3	10.167.126.2/32	10.167.126.2 – 10.167.126.2	10.167.126.2
4	10.167.126.3/32	10.167.126.3 – 10.167.126.3	10.167.126.3
5	10.167.126.4/32	10.167.126.4 – 10.167.126.4	10.167.126.4
6	10.167.126.5/32	10.167.126.5 – 10.167.126.5	10.167.126.5
7	10.167.126.6/32	10.167.126.6 – 10.167.126.6	10.167.126.6
8	10.167.126.7/32	10.167.126.7 – 10.167.126.7	10.167.126.7
9	10.167.126.8/32	10.167.126.8 – 10.167.126.8	10.167.126.8
10	10.167.126.9/32	10.167.126.9 – 10.167.126.9	10.167.126.9
11	10.167.126.10/32	10.167.126.10 – 10.167.126.10	10.167.126.10
12	10.167.126.11/32	10.167.126.11 – 10.167.126.11	10.167.126.11
13	10.167.126.12/32	10.167.126.12 – 10.167.126.12	10.167.126.12
14	10.167.126.13/32	10.167.126.13 – 10.167.126.13	10.167.126.13
15	10.167.126.14/32	10.167.126.14 – 10.167.126.14	10.167.126.14
16	10.167.126.15/32	10.167.126.15 – 10.167.126.15	10.167.126.15
17	10.167.126.16/32	10.167.126.16 – 10.167.126.16	10.167.126.16
18	10.167.126.17/32	10.167.126.17 – 10.167.126.17	10.167.126.17
19	10.167.126.18/32	10.167.126.18 – 10.167.126.18	10.167.126.18
20	10.167.126.19/32	10.167.126.19 – 10.167.126.19	10.167.126.19
21	10.167.126.20/32	10.167.126.20 – 10.167.126.20	10.167.126.20
22	10.167.126.21/32	10.167.126.21 – 10.167.126.21	10.167.126.21
23	10.167.126.22/32	10.167.126.22 – 10.167.126.22	10.167.126.22
24	10.167.126.23/32	10.167.126.23 – 10.167.126.23	10.167.126.23
25	10.167.126.24/32	10.167.126.24 – 10.167.126.24	10.167.126.24
26	10.167.126.25/32	10.167.126.25 – 10.167.126.25	10.167.126.25
27	10.167.126.26/32	10.167.126.26 – 10.167.126.26	10.167.126.26
28	10.167.126.27/32	10.167.126.27 – 10.167.126.27	10.167.126.27
29	10.167.126.28/32	10.167.126.28 – 10.167.126.28	10.167.126.28
30	10.167.126.29/32	10.167.126.29 – 10.167.126.29	10.167.126.29
31	10.167.126.30/32	10.167.126.30 – 10.167.126.30	10.167.126.30
32	10.167.126.31/32	10.167.126.31 – 10.167.126.31	10.167.126.31
33	10.167.126.32/32	10.167.126.32 – 10.167.126.32	10.167.126.32
34	10.167.126.33/32	10.167.126.33 – 10.167.126.33	10.167.126.33
35	10.167.126.34/32	10.167.126.34 – 10.167.126.34	10.167.126.34
36	10.167.126.35/32	10.167.126.35 – 10.167.126.35	10.167.126.35
37	10.167.126.36/32	10.167.126.36 – 10.167.126.36	10.167.126.36
38	10.167.126.37/32	10.167.126.37 – 10.167.126.37	10.167.126.37
39	10.167.126.38/32	10.167.126.38 – 10.167.126.38	10.167.126.38
40	10.167.126.39/32	10.167.126.39 – 10.167.126.39	10.167.126.39
41	10.167.126.40/32	10.167.126.40 – 10.167.126.40	10.167.126.40
42	10.167.126.41/32	10.167.126.41 – 10.167.126.41	10.167.126.41
43	10.167.126.42/32	10.167.126.42 – 10.167.126.42	10.167.126.42
44	10.167.126.43/32	10.167.126.43 – 10.167.126.43	10.167.126.43
45	10.167.126.44/32	10.167.126.44 – 10.167.126.44	10.167.126.44
46	10.167.126.45/32	10.167.126.45 – 10.167.126.45	10.167.126.45
47	10.167.126.46/32	10.167.126.46 – 10.167.126.46	10.167.126.46
48	10.167.126.47/32	10.167.126.47 – 10.167.126.47	10.167.126.47
49	10.167.126.48/32	10.167.126.48 – 10.167.126.48	10.167.126.48
50	10.167.126.49/32	10.167.126.49 – 10.167.126.49	10.167.126.49
51	10.167.126.50/32	10.167.126.50 – 10.167.126.50	10.167.126.50
52	10.167.126.51/32	10.167.126.51 – 10.167.126.51	10.167.126.51
53	10.167.126.52/32	10.167.126.52 – 10.167.126.52	10.167.126.52
54	10.167.126.53/32	10.167.126.53 – 10.167.126.53	10.167.126.53
55	10.167.126.54/32	10.167.126.54 – 10.167.126.54	10.167.126.54
56	10.167.126.55/32	10.167.126.55 – 10.167.126.55	10.167.126.55
57	10.167.126.56/32	10.167.126.56 – 10.167.126.56	10.167.126.56
58	10.167.126.57/32	10.167.126.57 – 10.167.126.57	10.167.126.57
59	10.167.126.58/32	10.167.126.58 – 10.167.126.58	10.167.126.58
60	10.167.126.59/32	10.167.126.59 – 10.167.126.59	10.167.126.59
61	10.167.126.60/32	10.167.126.60 – 10.167.126.60	10.167.126.60
62	10.167.126.61/32	10.167.126.61 – 10.167.126.61	10.167.126.61
63	10.167.126.62/32	10.167.126.62 – 10.167.126.62	10.167.126.62
64	10.167.126.63/32	10.167.126.63 – 10.167.126.63	10.167.126.63
65	10.167.126.64/32	10.167.126.64 – 10.167.126.64	10.167.126.64
66	10.167.126.65/32	10.167.126.65 – 10.167.126.65	10.167.126.65
67	10.167.126.66/32	10.167.126.66 – 10.167.126.66	10.167.126.66
68	10.167.126.67/32	10.167.126.67 – 10.167.126.67	10.167.126.67
69	10.167.126.68/32	10.167.126.68 – 10.167.126.68	10.167.126.68
70	10.167.126.69/32	10.167.126.69 – 10.167.126.69	10.167.126.69
71	10.167.126.70/32	10.167.126.70 – 10.167.126.70	10.167.126.70
72	10.167.126.71/32	10.167.126.71 – 10.167.126.71	10.167.126.71
73	10.167.126.72/32	10.167.126.72 – 10.167.126.72	10.167.126.72
74	10.167.126.73/32	10.167.126.73 – 10.167.126.73	10.167.126.73
75	10.167.126.74/32	10.167.126.74 – 10.167.126.74	10.167.126.74
76	10.167.126.75/32	10.167.126.75 – 10.167.126.75	10.167.126.75
77	10.167.126.76/32	10.167.126.76 – 10.167.126.76	10.167.126.76
78	10.167.126.77/32	10.167.126.77 – 10.167.126.77	10.167.126.77
79	10.167.126.78/32	10.167.126.78 – 10.167.126.78	10.167.126.78
80	10.167.126.79/32	10.167.126.79 – 10.167.126.79	10.167.126.79
81	10.167.126.80/32	10.167.126.80 – 10.167.126.80	10.167.126.80
82	10.167.126.81/32	10.167.126.81 – 10.167.126.81	10.167.126.81
83	10.167.126.82/32	10.167.126.82 – 10.167.126.82	10.167.126.82
84	10.167.126.83/32	10.167.126.83 – 10.167.126.83	10.167.126.83
85	10.167.126.84/32	10.167.126.84 – 10.167.126.84	10.167.126.84
86	10.167.126.85/32	10.167.126.85 – 10.167.126.85	10.167.126.85
87	10.167.126.86/32	10.167.126.86 – 10.167.126.86	10.167.126.86
88	10.167.126.87/32	10.167.126.87 – 10.167.126.87	10.167.126.87
89	10.167.126.88/32	10.167.126.88 – 10.167.126.88	10.167.126.88
90	10.167.126.89/32	10.167.126.89 – 10.167.126.89	10.167.126.89
91	10.167.126.90/32	10.167.126.90 – 10.167.126.90	10.167.126.90
92	10.167.126.91/32	10.167.126.91 – 10.167.126.91	10.167.126.91
93	10.167.126.92/32	10.167.126.92 – 10.167.126.92	10.167.126.92
94	10.167.126.93/32	10.167.126.93 – 10.167.126.93	10.167.126.93
95	10.167.126.94/32	10.167.126.94 – 10.167.126.94	10.167.126.94
96	10.167.126.95/32	10.167.126.95 – 10.167.126.95	10.167.126.95
97	10.167.126.96/32	10.167.126.96 – 10.167.126.96	10.167.126.96
98	10.167.126.97/32	10.167.126.97 – 10.167.126.97	10.167.126.97
99	10.167.126.98/32	10.167.126.98 – 10.167.126.98	10.167.126.98
100	10.167.126.99/32	10.167.126.99 – 10.167.126.99	10.167.126.99
101	10.167.126.100/32	10.167.126.100 – 10.167.126.100	10.167.126.100
102	10.167.126.101/32	10.167.126.101 – 10.167.126.101	10.167.126.101
103	10.167.126.102/32	10.167.126.102 – 10.167.126.102	10.167.126.102
104	10.167.126.103/32	10.167.126.103 – 10.167.126.103	10.167.126.103
105	10.167.126.104/32	10.167.126.104 – 10.167.126.104	10.167.126.104
106	10.167.126.105/32	10.167.126.105 – 10.167.126.105	10.167.126.105
107	10.167.126.106/32	10.167.126.106 – 10.167.126.106	10.167.126.106
108	10.167.126.107/32	10.167.126.107 – 10.167.126.107	10.167.126.107
109	10.167.126.108/32	10.167.126.108 – 10.167.126.108	10.167.126.108
110	10.167.126.109/32	10.167.126.109 – 10.167.126.109	10.167.126.109
111	10.167.126.110/32	10.167.126.110 – 10.167.126.110	10.167.126.110
112	10.167.126.111/32	10.167.126.111 – 10.167.126.111	10.167.126.111
113	10.167.126.112/32	10.167.126.112 – 10.167.126.112	10.167.126.112
114	10.167.126.113/32	10.167.126.113 – 10.167.126.113	10.167.126.113
115	10.167.126.114/32	10.167.126.114 – 10.167.126.114	10.167.126.114
116	10.167.126.115/32	10.167.126.115 – 10.167.126.115	10.167.126.115
117	10.167.126.116/32	10.167.126.116 – 10.167.126.116	10.167.126.116
118	10.167.126.117/32	10.167.126.117 – 10.167.126.117	10.167.126.117
119	10.167.126.118/32	10.167.126.118 – 10.167.126.118	10.167.126.118
120	10.167.126.119/32	10.167.126.119 – 10.167.126.119	10.167.126.119
121	10.167.126.120/32	10.167.126.120 – 10.167.126.120	10.167.126.120
122	10.167.126.121/32	10.167.126.121 – 10.167.126.121	10.167.126.121
123	10.167.126.122/32	10.167.126.122 – 10.167.126.122	10.167.126.122
124	10.167.126.123/32	10.167.126.123 – 10.167.126.123	10.167.126.123
125	10.167.126.124/32	10.167.126.124 – 10.167.126.124	10.167.126.124
126	10.167.126.125/32	10.167.126.125 – 10.167.126.125	10.167.126.125
127	10.167.126.126/32	10.167.126.126 – 10.167.126.126	10.167.126.126
128	10.167.126.127/32	10.167.126.127 – 10.167.126.127	10.167.126.127

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 →