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)10.167.212.0/25

network10.167.212.0/25

broadcast10.167.212.127

first host10.167.212.1

last host10.167.212.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.212.0/25

address00001010.10100111.11010100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11010100.00000000

broadcast00001010.10100111.11010100.01111111

green = network part, grey = host part

hex0x0aa7d400

decimal178770944

reverse dns0.212.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:d400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.212.0/32	10.167.212.0 – 10.167.212.0	10.167.212.0
2	10.167.212.1/32	10.167.212.1 – 10.167.212.1	10.167.212.1
3	10.167.212.2/32	10.167.212.2 – 10.167.212.2	10.167.212.2
4	10.167.212.3/32	10.167.212.3 – 10.167.212.3	10.167.212.3
5	10.167.212.4/32	10.167.212.4 – 10.167.212.4	10.167.212.4
6	10.167.212.5/32	10.167.212.5 – 10.167.212.5	10.167.212.5
7	10.167.212.6/32	10.167.212.6 – 10.167.212.6	10.167.212.6
8	10.167.212.7/32	10.167.212.7 – 10.167.212.7	10.167.212.7
9	10.167.212.8/32	10.167.212.8 – 10.167.212.8	10.167.212.8
10	10.167.212.9/32	10.167.212.9 – 10.167.212.9	10.167.212.9
11	10.167.212.10/32	10.167.212.10 – 10.167.212.10	10.167.212.10
12	10.167.212.11/32	10.167.212.11 – 10.167.212.11	10.167.212.11
13	10.167.212.12/32	10.167.212.12 – 10.167.212.12	10.167.212.12
14	10.167.212.13/32	10.167.212.13 – 10.167.212.13	10.167.212.13
15	10.167.212.14/32	10.167.212.14 – 10.167.212.14	10.167.212.14
16	10.167.212.15/32	10.167.212.15 – 10.167.212.15	10.167.212.15
17	10.167.212.16/32	10.167.212.16 – 10.167.212.16	10.167.212.16
18	10.167.212.17/32	10.167.212.17 – 10.167.212.17	10.167.212.17
19	10.167.212.18/32	10.167.212.18 – 10.167.212.18	10.167.212.18
20	10.167.212.19/32	10.167.212.19 – 10.167.212.19	10.167.212.19
21	10.167.212.20/32	10.167.212.20 – 10.167.212.20	10.167.212.20
22	10.167.212.21/32	10.167.212.21 – 10.167.212.21	10.167.212.21
23	10.167.212.22/32	10.167.212.22 – 10.167.212.22	10.167.212.22
24	10.167.212.23/32	10.167.212.23 – 10.167.212.23	10.167.212.23
25	10.167.212.24/32	10.167.212.24 – 10.167.212.24	10.167.212.24
26	10.167.212.25/32	10.167.212.25 – 10.167.212.25	10.167.212.25
27	10.167.212.26/32	10.167.212.26 – 10.167.212.26	10.167.212.26
28	10.167.212.27/32	10.167.212.27 – 10.167.212.27	10.167.212.27
29	10.167.212.28/32	10.167.212.28 – 10.167.212.28	10.167.212.28
30	10.167.212.29/32	10.167.212.29 – 10.167.212.29	10.167.212.29
31	10.167.212.30/32	10.167.212.30 – 10.167.212.30	10.167.212.30
32	10.167.212.31/32	10.167.212.31 – 10.167.212.31	10.167.212.31
33	10.167.212.32/32	10.167.212.32 – 10.167.212.32	10.167.212.32
34	10.167.212.33/32	10.167.212.33 – 10.167.212.33	10.167.212.33
35	10.167.212.34/32	10.167.212.34 – 10.167.212.34	10.167.212.34
36	10.167.212.35/32	10.167.212.35 – 10.167.212.35	10.167.212.35
37	10.167.212.36/32	10.167.212.36 – 10.167.212.36	10.167.212.36
38	10.167.212.37/32	10.167.212.37 – 10.167.212.37	10.167.212.37
39	10.167.212.38/32	10.167.212.38 – 10.167.212.38	10.167.212.38
40	10.167.212.39/32	10.167.212.39 – 10.167.212.39	10.167.212.39
41	10.167.212.40/32	10.167.212.40 – 10.167.212.40	10.167.212.40
42	10.167.212.41/32	10.167.212.41 – 10.167.212.41	10.167.212.41
43	10.167.212.42/32	10.167.212.42 – 10.167.212.42	10.167.212.42
44	10.167.212.43/32	10.167.212.43 – 10.167.212.43	10.167.212.43
45	10.167.212.44/32	10.167.212.44 – 10.167.212.44	10.167.212.44
46	10.167.212.45/32	10.167.212.45 – 10.167.212.45	10.167.212.45
47	10.167.212.46/32	10.167.212.46 – 10.167.212.46	10.167.212.46
48	10.167.212.47/32	10.167.212.47 – 10.167.212.47	10.167.212.47
49	10.167.212.48/32	10.167.212.48 – 10.167.212.48	10.167.212.48
50	10.167.212.49/32	10.167.212.49 – 10.167.212.49	10.167.212.49
51	10.167.212.50/32	10.167.212.50 – 10.167.212.50	10.167.212.50
52	10.167.212.51/32	10.167.212.51 – 10.167.212.51	10.167.212.51
53	10.167.212.52/32	10.167.212.52 – 10.167.212.52	10.167.212.52
54	10.167.212.53/32	10.167.212.53 – 10.167.212.53	10.167.212.53
55	10.167.212.54/32	10.167.212.54 – 10.167.212.54	10.167.212.54
56	10.167.212.55/32	10.167.212.55 – 10.167.212.55	10.167.212.55
57	10.167.212.56/32	10.167.212.56 – 10.167.212.56	10.167.212.56
58	10.167.212.57/32	10.167.212.57 – 10.167.212.57	10.167.212.57
59	10.167.212.58/32	10.167.212.58 – 10.167.212.58	10.167.212.58
60	10.167.212.59/32	10.167.212.59 – 10.167.212.59	10.167.212.59
61	10.167.212.60/32	10.167.212.60 – 10.167.212.60	10.167.212.60
62	10.167.212.61/32	10.167.212.61 – 10.167.212.61	10.167.212.61
63	10.167.212.62/32	10.167.212.62 – 10.167.212.62	10.167.212.62
64	10.167.212.63/32	10.167.212.63 – 10.167.212.63	10.167.212.63
65	10.167.212.64/32	10.167.212.64 – 10.167.212.64	10.167.212.64
66	10.167.212.65/32	10.167.212.65 – 10.167.212.65	10.167.212.65
67	10.167.212.66/32	10.167.212.66 – 10.167.212.66	10.167.212.66
68	10.167.212.67/32	10.167.212.67 – 10.167.212.67	10.167.212.67
69	10.167.212.68/32	10.167.212.68 – 10.167.212.68	10.167.212.68
70	10.167.212.69/32	10.167.212.69 – 10.167.212.69	10.167.212.69
71	10.167.212.70/32	10.167.212.70 – 10.167.212.70	10.167.212.70
72	10.167.212.71/32	10.167.212.71 – 10.167.212.71	10.167.212.71
73	10.167.212.72/32	10.167.212.72 – 10.167.212.72	10.167.212.72
74	10.167.212.73/32	10.167.212.73 – 10.167.212.73	10.167.212.73
75	10.167.212.74/32	10.167.212.74 – 10.167.212.74	10.167.212.74
76	10.167.212.75/32	10.167.212.75 – 10.167.212.75	10.167.212.75
77	10.167.212.76/32	10.167.212.76 – 10.167.212.76	10.167.212.76
78	10.167.212.77/32	10.167.212.77 – 10.167.212.77	10.167.212.77
79	10.167.212.78/32	10.167.212.78 – 10.167.212.78	10.167.212.78
80	10.167.212.79/32	10.167.212.79 – 10.167.212.79	10.167.212.79
81	10.167.212.80/32	10.167.212.80 – 10.167.212.80	10.167.212.80
82	10.167.212.81/32	10.167.212.81 – 10.167.212.81	10.167.212.81
83	10.167.212.82/32	10.167.212.82 – 10.167.212.82	10.167.212.82
84	10.167.212.83/32	10.167.212.83 – 10.167.212.83	10.167.212.83
85	10.167.212.84/32	10.167.212.84 – 10.167.212.84	10.167.212.84
86	10.167.212.85/32	10.167.212.85 – 10.167.212.85	10.167.212.85
87	10.167.212.86/32	10.167.212.86 – 10.167.212.86	10.167.212.86
88	10.167.212.87/32	10.167.212.87 – 10.167.212.87	10.167.212.87
89	10.167.212.88/32	10.167.212.88 – 10.167.212.88	10.167.212.88
90	10.167.212.89/32	10.167.212.89 – 10.167.212.89	10.167.212.89
91	10.167.212.90/32	10.167.212.90 – 10.167.212.90	10.167.212.90
92	10.167.212.91/32	10.167.212.91 – 10.167.212.91	10.167.212.91
93	10.167.212.92/32	10.167.212.92 – 10.167.212.92	10.167.212.92
94	10.167.212.93/32	10.167.212.93 – 10.167.212.93	10.167.212.93
95	10.167.212.94/32	10.167.212.94 – 10.167.212.94	10.167.212.94
96	10.167.212.95/32	10.167.212.95 – 10.167.212.95	10.167.212.95
97	10.167.212.96/32	10.167.212.96 – 10.167.212.96	10.167.212.96
98	10.167.212.97/32	10.167.212.97 – 10.167.212.97	10.167.212.97
99	10.167.212.98/32	10.167.212.98 – 10.167.212.98	10.167.212.98
100	10.167.212.99/32	10.167.212.99 – 10.167.212.99	10.167.212.99
101	10.167.212.100/32	10.167.212.100 – 10.167.212.100	10.167.212.100
102	10.167.212.101/32	10.167.212.101 – 10.167.212.101	10.167.212.101
103	10.167.212.102/32	10.167.212.102 – 10.167.212.102	10.167.212.102
104	10.167.212.103/32	10.167.212.103 – 10.167.212.103	10.167.212.103
105	10.167.212.104/32	10.167.212.104 – 10.167.212.104	10.167.212.104
106	10.167.212.105/32	10.167.212.105 – 10.167.212.105	10.167.212.105
107	10.167.212.106/32	10.167.212.106 – 10.167.212.106	10.167.212.106
108	10.167.212.107/32	10.167.212.107 – 10.167.212.107	10.167.212.107
109	10.167.212.108/32	10.167.212.108 – 10.167.212.108	10.167.212.108
110	10.167.212.109/32	10.167.212.109 – 10.167.212.109	10.167.212.109
111	10.167.212.110/32	10.167.212.110 – 10.167.212.110	10.167.212.110
112	10.167.212.111/32	10.167.212.111 – 10.167.212.111	10.167.212.111
113	10.167.212.112/32	10.167.212.112 – 10.167.212.112	10.167.212.112
114	10.167.212.113/32	10.167.212.113 – 10.167.212.113	10.167.212.113
115	10.167.212.114/32	10.167.212.114 – 10.167.212.114	10.167.212.114
116	10.167.212.115/32	10.167.212.115 – 10.167.212.115	10.167.212.115
117	10.167.212.116/32	10.167.212.116 – 10.167.212.116	10.167.212.116
118	10.167.212.117/32	10.167.212.117 – 10.167.212.117	10.167.212.117
119	10.167.212.118/32	10.167.212.118 – 10.167.212.118	10.167.212.118
120	10.167.212.119/32	10.167.212.119 – 10.167.212.119	10.167.212.119
121	10.167.212.120/32	10.167.212.120 – 10.167.212.120	10.167.212.120
122	10.167.212.121/32	10.167.212.121 – 10.167.212.121	10.167.212.121
123	10.167.212.122/32	10.167.212.122 – 10.167.212.122	10.167.212.122
124	10.167.212.123/32	10.167.212.123 – 10.167.212.123	10.167.212.123
125	10.167.212.124/32	10.167.212.124 – 10.167.212.124	10.167.212.124
126	10.167.212.125/32	10.167.212.125 – 10.167.212.125	10.167.212.125
127	10.167.212.126/32	10.167.212.126 – 10.167.212.126	10.167.212.126
128	10.167.212.127/32	10.167.212.127 – 10.167.212.127	10.167.212.127

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 →