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)10.167.164.0/25

network10.167.164.0/25

broadcast10.167.164.127

first host10.167.164.1

last host10.167.164.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.164.0/25

address00001010.10100111.10100100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10100100.00000000

broadcast00001010.10100111.10100100.01111111

green = network part, grey = host part

hex0x0aa7a400

decimal178758656

reverse dns0.164.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:a400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.164.0/32	10.167.164.0 – 10.167.164.0	10.167.164.0
2	10.167.164.1/32	10.167.164.1 – 10.167.164.1	10.167.164.1
3	10.167.164.2/32	10.167.164.2 – 10.167.164.2	10.167.164.2
4	10.167.164.3/32	10.167.164.3 – 10.167.164.3	10.167.164.3
5	10.167.164.4/32	10.167.164.4 – 10.167.164.4	10.167.164.4
6	10.167.164.5/32	10.167.164.5 – 10.167.164.5	10.167.164.5
7	10.167.164.6/32	10.167.164.6 – 10.167.164.6	10.167.164.6
8	10.167.164.7/32	10.167.164.7 – 10.167.164.7	10.167.164.7
9	10.167.164.8/32	10.167.164.8 – 10.167.164.8	10.167.164.8
10	10.167.164.9/32	10.167.164.9 – 10.167.164.9	10.167.164.9
11	10.167.164.10/32	10.167.164.10 – 10.167.164.10	10.167.164.10
12	10.167.164.11/32	10.167.164.11 – 10.167.164.11	10.167.164.11
13	10.167.164.12/32	10.167.164.12 – 10.167.164.12	10.167.164.12
14	10.167.164.13/32	10.167.164.13 – 10.167.164.13	10.167.164.13
15	10.167.164.14/32	10.167.164.14 – 10.167.164.14	10.167.164.14
16	10.167.164.15/32	10.167.164.15 – 10.167.164.15	10.167.164.15
17	10.167.164.16/32	10.167.164.16 – 10.167.164.16	10.167.164.16
18	10.167.164.17/32	10.167.164.17 – 10.167.164.17	10.167.164.17
19	10.167.164.18/32	10.167.164.18 – 10.167.164.18	10.167.164.18
20	10.167.164.19/32	10.167.164.19 – 10.167.164.19	10.167.164.19
21	10.167.164.20/32	10.167.164.20 – 10.167.164.20	10.167.164.20
22	10.167.164.21/32	10.167.164.21 – 10.167.164.21	10.167.164.21
23	10.167.164.22/32	10.167.164.22 – 10.167.164.22	10.167.164.22
24	10.167.164.23/32	10.167.164.23 – 10.167.164.23	10.167.164.23
25	10.167.164.24/32	10.167.164.24 – 10.167.164.24	10.167.164.24
26	10.167.164.25/32	10.167.164.25 – 10.167.164.25	10.167.164.25
27	10.167.164.26/32	10.167.164.26 – 10.167.164.26	10.167.164.26
28	10.167.164.27/32	10.167.164.27 – 10.167.164.27	10.167.164.27
29	10.167.164.28/32	10.167.164.28 – 10.167.164.28	10.167.164.28
30	10.167.164.29/32	10.167.164.29 – 10.167.164.29	10.167.164.29
31	10.167.164.30/32	10.167.164.30 – 10.167.164.30	10.167.164.30
32	10.167.164.31/32	10.167.164.31 – 10.167.164.31	10.167.164.31
33	10.167.164.32/32	10.167.164.32 – 10.167.164.32	10.167.164.32
34	10.167.164.33/32	10.167.164.33 – 10.167.164.33	10.167.164.33
35	10.167.164.34/32	10.167.164.34 – 10.167.164.34	10.167.164.34
36	10.167.164.35/32	10.167.164.35 – 10.167.164.35	10.167.164.35
37	10.167.164.36/32	10.167.164.36 – 10.167.164.36	10.167.164.36
38	10.167.164.37/32	10.167.164.37 – 10.167.164.37	10.167.164.37
39	10.167.164.38/32	10.167.164.38 – 10.167.164.38	10.167.164.38
40	10.167.164.39/32	10.167.164.39 – 10.167.164.39	10.167.164.39
41	10.167.164.40/32	10.167.164.40 – 10.167.164.40	10.167.164.40
42	10.167.164.41/32	10.167.164.41 – 10.167.164.41	10.167.164.41
43	10.167.164.42/32	10.167.164.42 – 10.167.164.42	10.167.164.42
44	10.167.164.43/32	10.167.164.43 – 10.167.164.43	10.167.164.43
45	10.167.164.44/32	10.167.164.44 – 10.167.164.44	10.167.164.44
46	10.167.164.45/32	10.167.164.45 – 10.167.164.45	10.167.164.45
47	10.167.164.46/32	10.167.164.46 – 10.167.164.46	10.167.164.46
48	10.167.164.47/32	10.167.164.47 – 10.167.164.47	10.167.164.47
49	10.167.164.48/32	10.167.164.48 – 10.167.164.48	10.167.164.48
50	10.167.164.49/32	10.167.164.49 – 10.167.164.49	10.167.164.49
51	10.167.164.50/32	10.167.164.50 – 10.167.164.50	10.167.164.50
52	10.167.164.51/32	10.167.164.51 – 10.167.164.51	10.167.164.51
53	10.167.164.52/32	10.167.164.52 – 10.167.164.52	10.167.164.52
54	10.167.164.53/32	10.167.164.53 – 10.167.164.53	10.167.164.53
55	10.167.164.54/32	10.167.164.54 – 10.167.164.54	10.167.164.54
56	10.167.164.55/32	10.167.164.55 – 10.167.164.55	10.167.164.55
57	10.167.164.56/32	10.167.164.56 – 10.167.164.56	10.167.164.56
58	10.167.164.57/32	10.167.164.57 – 10.167.164.57	10.167.164.57
59	10.167.164.58/32	10.167.164.58 – 10.167.164.58	10.167.164.58
60	10.167.164.59/32	10.167.164.59 – 10.167.164.59	10.167.164.59
61	10.167.164.60/32	10.167.164.60 – 10.167.164.60	10.167.164.60
62	10.167.164.61/32	10.167.164.61 – 10.167.164.61	10.167.164.61
63	10.167.164.62/32	10.167.164.62 – 10.167.164.62	10.167.164.62
64	10.167.164.63/32	10.167.164.63 – 10.167.164.63	10.167.164.63
65	10.167.164.64/32	10.167.164.64 – 10.167.164.64	10.167.164.64
66	10.167.164.65/32	10.167.164.65 – 10.167.164.65	10.167.164.65
67	10.167.164.66/32	10.167.164.66 – 10.167.164.66	10.167.164.66
68	10.167.164.67/32	10.167.164.67 – 10.167.164.67	10.167.164.67
69	10.167.164.68/32	10.167.164.68 – 10.167.164.68	10.167.164.68
70	10.167.164.69/32	10.167.164.69 – 10.167.164.69	10.167.164.69
71	10.167.164.70/32	10.167.164.70 – 10.167.164.70	10.167.164.70
72	10.167.164.71/32	10.167.164.71 – 10.167.164.71	10.167.164.71
73	10.167.164.72/32	10.167.164.72 – 10.167.164.72	10.167.164.72
74	10.167.164.73/32	10.167.164.73 – 10.167.164.73	10.167.164.73
75	10.167.164.74/32	10.167.164.74 – 10.167.164.74	10.167.164.74
76	10.167.164.75/32	10.167.164.75 – 10.167.164.75	10.167.164.75
77	10.167.164.76/32	10.167.164.76 – 10.167.164.76	10.167.164.76
78	10.167.164.77/32	10.167.164.77 – 10.167.164.77	10.167.164.77
79	10.167.164.78/32	10.167.164.78 – 10.167.164.78	10.167.164.78
80	10.167.164.79/32	10.167.164.79 – 10.167.164.79	10.167.164.79
81	10.167.164.80/32	10.167.164.80 – 10.167.164.80	10.167.164.80
82	10.167.164.81/32	10.167.164.81 – 10.167.164.81	10.167.164.81
83	10.167.164.82/32	10.167.164.82 – 10.167.164.82	10.167.164.82
84	10.167.164.83/32	10.167.164.83 – 10.167.164.83	10.167.164.83
85	10.167.164.84/32	10.167.164.84 – 10.167.164.84	10.167.164.84
86	10.167.164.85/32	10.167.164.85 – 10.167.164.85	10.167.164.85
87	10.167.164.86/32	10.167.164.86 – 10.167.164.86	10.167.164.86
88	10.167.164.87/32	10.167.164.87 – 10.167.164.87	10.167.164.87
89	10.167.164.88/32	10.167.164.88 – 10.167.164.88	10.167.164.88
90	10.167.164.89/32	10.167.164.89 – 10.167.164.89	10.167.164.89
91	10.167.164.90/32	10.167.164.90 – 10.167.164.90	10.167.164.90
92	10.167.164.91/32	10.167.164.91 – 10.167.164.91	10.167.164.91
93	10.167.164.92/32	10.167.164.92 – 10.167.164.92	10.167.164.92
94	10.167.164.93/32	10.167.164.93 – 10.167.164.93	10.167.164.93
95	10.167.164.94/32	10.167.164.94 – 10.167.164.94	10.167.164.94
96	10.167.164.95/32	10.167.164.95 – 10.167.164.95	10.167.164.95
97	10.167.164.96/32	10.167.164.96 – 10.167.164.96	10.167.164.96
98	10.167.164.97/32	10.167.164.97 – 10.167.164.97	10.167.164.97
99	10.167.164.98/32	10.167.164.98 – 10.167.164.98	10.167.164.98
100	10.167.164.99/32	10.167.164.99 – 10.167.164.99	10.167.164.99
101	10.167.164.100/32	10.167.164.100 – 10.167.164.100	10.167.164.100
102	10.167.164.101/32	10.167.164.101 – 10.167.164.101	10.167.164.101
103	10.167.164.102/32	10.167.164.102 – 10.167.164.102	10.167.164.102
104	10.167.164.103/32	10.167.164.103 – 10.167.164.103	10.167.164.103
105	10.167.164.104/32	10.167.164.104 – 10.167.164.104	10.167.164.104
106	10.167.164.105/32	10.167.164.105 – 10.167.164.105	10.167.164.105
107	10.167.164.106/32	10.167.164.106 – 10.167.164.106	10.167.164.106
108	10.167.164.107/32	10.167.164.107 – 10.167.164.107	10.167.164.107
109	10.167.164.108/32	10.167.164.108 – 10.167.164.108	10.167.164.108
110	10.167.164.109/32	10.167.164.109 – 10.167.164.109	10.167.164.109
111	10.167.164.110/32	10.167.164.110 – 10.167.164.110	10.167.164.110
112	10.167.164.111/32	10.167.164.111 – 10.167.164.111	10.167.164.111
113	10.167.164.112/32	10.167.164.112 – 10.167.164.112	10.167.164.112
114	10.167.164.113/32	10.167.164.113 – 10.167.164.113	10.167.164.113
115	10.167.164.114/32	10.167.164.114 – 10.167.164.114	10.167.164.114
116	10.167.164.115/32	10.167.164.115 – 10.167.164.115	10.167.164.115
117	10.167.164.116/32	10.167.164.116 – 10.167.164.116	10.167.164.116
118	10.167.164.117/32	10.167.164.117 – 10.167.164.117	10.167.164.117
119	10.167.164.118/32	10.167.164.118 – 10.167.164.118	10.167.164.118
120	10.167.164.119/32	10.167.164.119 – 10.167.164.119	10.167.164.119
121	10.167.164.120/32	10.167.164.120 – 10.167.164.120	10.167.164.120
122	10.167.164.121/32	10.167.164.121 – 10.167.164.121	10.167.164.121
123	10.167.164.122/32	10.167.164.122 – 10.167.164.122	10.167.164.122
124	10.167.164.123/32	10.167.164.123 – 10.167.164.123	10.167.164.123
125	10.167.164.124/32	10.167.164.124 – 10.167.164.124	10.167.164.124
126	10.167.164.125/32	10.167.164.125 – 10.167.164.125	10.167.164.125
127	10.167.164.126/32	10.167.164.126 – 10.167.164.126	10.167.164.126
128	10.167.164.127/32	10.167.164.127 – 10.167.164.127	10.167.164.127

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 →