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)10.167.128.0/25

network10.167.128.0/25

broadcast10.167.128.127

first host10.167.128.1

last host10.167.128.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.128.0/25

address00001010.10100111.10000000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10000000.00000000

broadcast00001010.10100111.10000000.01111111

green = network part, grey = host part

hex0x0aa78000

decimal178749440

reverse dns0.128.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.128.0/32	10.167.128.0 – 10.167.128.0	10.167.128.0
2	10.167.128.1/32	10.167.128.1 – 10.167.128.1	10.167.128.1
3	10.167.128.2/32	10.167.128.2 – 10.167.128.2	10.167.128.2
4	10.167.128.3/32	10.167.128.3 – 10.167.128.3	10.167.128.3
5	10.167.128.4/32	10.167.128.4 – 10.167.128.4	10.167.128.4
6	10.167.128.5/32	10.167.128.5 – 10.167.128.5	10.167.128.5
7	10.167.128.6/32	10.167.128.6 – 10.167.128.6	10.167.128.6
8	10.167.128.7/32	10.167.128.7 – 10.167.128.7	10.167.128.7
9	10.167.128.8/32	10.167.128.8 – 10.167.128.8	10.167.128.8
10	10.167.128.9/32	10.167.128.9 – 10.167.128.9	10.167.128.9
11	10.167.128.10/32	10.167.128.10 – 10.167.128.10	10.167.128.10
12	10.167.128.11/32	10.167.128.11 – 10.167.128.11	10.167.128.11
13	10.167.128.12/32	10.167.128.12 – 10.167.128.12	10.167.128.12
14	10.167.128.13/32	10.167.128.13 – 10.167.128.13	10.167.128.13
15	10.167.128.14/32	10.167.128.14 – 10.167.128.14	10.167.128.14
16	10.167.128.15/32	10.167.128.15 – 10.167.128.15	10.167.128.15
17	10.167.128.16/32	10.167.128.16 – 10.167.128.16	10.167.128.16
18	10.167.128.17/32	10.167.128.17 – 10.167.128.17	10.167.128.17
19	10.167.128.18/32	10.167.128.18 – 10.167.128.18	10.167.128.18
20	10.167.128.19/32	10.167.128.19 – 10.167.128.19	10.167.128.19
21	10.167.128.20/32	10.167.128.20 – 10.167.128.20	10.167.128.20
22	10.167.128.21/32	10.167.128.21 – 10.167.128.21	10.167.128.21
23	10.167.128.22/32	10.167.128.22 – 10.167.128.22	10.167.128.22
24	10.167.128.23/32	10.167.128.23 – 10.167.128.23	10.167.128.23
25	10.167.128.24/32	10.167.128.24 – 10.167.128.24	10.167.128.24
26	10.167.128.25/32	10.167.128.25 – 10.167.128.25	10.167.128.25
27	10.167.128.26/32	10.167.128.26 – 10.167.128.26	10.167.128.26
28	10.167.128.27/32	10.167.128.27 – 10.167.128.27	10.167.128.27
29	10.167.128.28/32	10.167.128.28 – 10.167.128.28	10.167.128.28
30	10.167.128.29/32	10.167.128.29 – 10.167.128.29	10.167.128.29
31	10.167.128.30/32	10.167.128.30 – 10.167.128.30	10.167.128.30
32	10.167.128.31/32	10.167.128.31 – 10.167.128.31	10.167.128.31
33	10.167.128.32/32	10.167.128.32 – 10.167.128.32	10.167.128.32
34	10.167.128.33/32	10.167.128.33 – 10.167.128.33	10.167.128.33
35	10.167.128.34/32	10.167.128.34 – 10.167.128.34	10.167.128.34
36	10.167.128.35/32	10.167.128.35 – 10.167.128.35	10.167.128.35
37	10.167.128.36/32	10.167.128.36 – 10.167.128.36	10.167.128.36
38	10.167.128.37/32	10.167.128.37 – 10.167.128.37	10.167.128.37
39	10.167.128.38/32	10.167.128.38 – 10.167.128.38	10.167.128.38
40	10.167.128.39/32	10.167.128.39 – 10.167.128.39	10.167.128.39
41	10.167.128.40/32	10.167.128.40 – 10.167.128.40	10.167.128.40
42	10.167.128.41/32	10.167.128.41 – 10.167.128.41	10.167.128.41
43	10.167.128.42/32	10.167.128.42 – 10.167.128.42	10.167.128.42
44	10.167.128.43/32	10.167.128.43 – 10.167.128.43	10.167.128.43
45	10.167.128.44/32	10.167.128.44 – 10.167.128.44	10.167.128.44
46	10.167.128.45/32	10.167.128.45 – 10.167.128.45	10.167.128.45
47	10.167.128.46/32	10.167.128.46 – 10.167.128.46	10.167.128.46
48	10.167.128.47/32	10.167.128.47 – 10.167.128.47	10.167.128.47
49	10.167.128.48/32	10.167.128.48 – 10.167.128.48	10.167.128.48
50	10.167.128.49/32	10.167.128.49 – 10.167.128.49	10.167.128.49
51	10.167.128.50/32	10.167.128.50 – 10.167.128.50	10.167.128.50
52	10.167.128.51/32	10.167.128.51 – 10.167.128.51	10.167.128.51
53	10.167.128.52/32	10.167.128.52 – 10.167.128.52	10.167.128.52
54	10.167.128.53/32	10.167.128.53 – 10.167.128.53	10.167.128.53
55	10.167.128.54/32	10.167.128.54 – 10.167.128.54	10.167.128.54
56	10.167.128.55/32	10.167.128.55 – 10.167.128.55	10.167.128.55
57	10.167.128.56/32	10.167.128.56 – 10.167.128.56	10.167.128.56
58	10.167.128.57/32	10.167.128.57 – 10.167.128.57	10.167.128.57
59	10.167.128.58/32	10.167.128.58 – 10.167.128.58	10.167.128.58
60	10.167.128.59/32	10.167.128.59 – 10.167.128.59	10.167.128.59
61	10.167.128.60/32	10.167.128.60 – 10.167.128.60	10.167.128.60
62	10.167.128.61/32	10.167.128.61 – 10.167.128.61	10.167.128.61
63	10.167.128.62/32	10.167.128.62 – 10.167.128.62	10.167.128.62
64	10.167.128.63/32	10.167.128.63 – 10.167.128.63	10.167.128.63
65	10.167.128.64/32	10.167.128.64 – 10.167.128.64	10.167.128.64
66	10.167.128.65/32	10.167.128.65 – 10.167.128.65	10.167.128.65
67	10.167.128.66/32	10.167.128.66 – 10.167.128.66	10.167.128.66
68	10.167.128.67/32	10.167.128.67 – 10.167.128.67	10.167.128.67
69	10.167.128.68/32	10.167.128.68 – 10.167.128.68	10.167.128.68
70	10.167.128.69/32	10.167.128.69 – 10.167.128.69	10.167.128.69
71	10.167.128.70/32	10.167.128.70 – 10.167.128.70	10.167.128.70
72	10.167.128.71/32	10.167.128.71 – 10.167.128.71	10.167.128.71
73	10.167.128.72/32	10.167.128.72 – 10.167.128.72	10.167.128.72
74	10.167.128.73/32	10.167.128.73 – 10.167.128.73	10.167.128.73
75	10.167.128.74/32	10.167.128.74 – 10.167.128.74	10.167.128.74
76	10.167.128.75/32	10.167.128.75 – 10.167.128.75	10.167.128.75
77	10.167.128.76/32	10.167.128.76 – 10.167.128.76	10.167.128.76
78	10.167.128.77/32	10.167.128.77 – 10.167.128.77	10.167.128.77
79	10.167.128.78/32	10.167.128.78 – 10.167.128.78	10.167.128.78
80	10.167.128.79/32	10.167.128.79 – 10.167.128.79	10.167.128.79
81	10.167.128.80/32	10.167.128.80 – 10.167.128.80	10.167.128.80
82	10.167.128.81/32	10.167.128.81 – 10.167.128.81	10.167.128.81
83	10.167.128.82/32	10.167.128.82 – 10.167.128.82	10.167.128.82
84	10.167.128.83/32	10.167.128.83 – 10.167.128.83	10.167.128.83
85	10.167.128.84/32	10.167.128.84 – 10.167.128.84	10.167.128.84
86	10.167.128.85/32	10.167.128.85 – 10.167.128.85	10.167.128.85
87	10.167.128.86/32	10.167.128.86 – 10.167.128.86	10.167.128.86
88	10.167.128.87/32	10.167.128.87 – 10.167.128.87	10.167.128.87
89	10.167.128.88/32	10.167.128.88 – 10.167.128.88	10.167.128.88
90	10.167.128.89/32	10.167.128.89 – 10.167.128.89	10.167.128.89
91	10.167.128.90/32	10.167.128.90 – 10.167.128.90	10.167.128.90
92	10.167.128.91/32	10.167.128.91 – 10.167.128.91	10.167.128.91
93	10.167.128.92/32	10.167.128.92 – 10.167.128.92	10.167.128.92
94	10.167.128.93/32	10.167.128.93 – 10.167.128.93	10.167.128.93
95	10.167.128.94/32	10.167.128.94 – 10.167.128.94	10.167.128.94
96	10.167.128.95/32	10.167.128.95 – 10.167.128.95	10.167.128.95
97	10.167.128.96/32	10.167.128.96 – 10.167.128.96	10.167.128.96
98	10.167.128.97/32	10.167.128.97 – 10.167.128.97	10.167.128.97
99	10.167.128.98/32	10.167.128.98 – 10.167.128.98	10.167.128.98
100	10.167.128.99/32	10.167.128.99 – 10.167.128.99	10.167.128.99
101	10.167.128.100/32	10.167.128.100 – 10.167.128.100	10.167.128.100
102	10.167.128.101/32	10.167.128.101 – 10.167.128.101	10.167.128.101
103	10.167.128.102/32	10.167.128.102 – 10.167.128.102	10.167.128.102
104	10.167.128.103/32	10.167.128.103 – 10.167.128.103	10.167.128.103
105	10.167.128.104/32	10.167.128.104 – 10.167.128.104	10.167.128.104
106	10.167.128.105/32	10.167.128.105 – 10.167.128.105	10.167.128.105
107	10.167.128.106/32	10.167.128.106 – 10.167.128.106	10.167.128.106
108	10.167.128.107/32	10.167.128.107 – 10.167.128.107	10.167.128.107
109	10.167.128.108/32	10.167.128.108 – 10.167.128.108	10.167.128.108
110	10.167.128.109/32	10.167.128.109 – 10.167.128.109	10.167.128.109
111	10.167.128.110/32	10.167.128.110 – 10.167.128.110	10.167.128.110
112	10.167.128.111/32	10.167.128.111 – 10.167.128.111	10.167.128.111
113	10.167.128.112/32	10.167.128.112 – 10.167.128.112	10.167.128.112
114	10.167.128.113/32	10.167.128.113 – 10.167.128.113	10.167.128.113
115	10.167.128.114/32	10.167.128.114 – 10.167.128.114	10.167.128.114
116	10.167.128.115/32	10.167.128.115 – 10.167.128.115	10.167.128.115
117	10.167.128.116/32	10.167.128.116 – 10.167.128.116	10.167.128.116
118	10.167.128.117/32	10.167.128.117 – 10.167.128.117	10.167.128.117
119	10.167.128.118/32	10.167.128.118 – 10.167.128.118	10.167.128.118
120	10.167.128.119/32	10.167.128.119 – 10.167.128.119	10.167.128.119
121	10.167.128.120/32	10.167.128.120 – 10.167.128.120	10.167.128.120
122	10.167.128.121/32	10.167.128.121 – 10.167.128.121	10.167.128.121
123	10.167.128.122/32	10.167.128.122 – 10.167.128.122	10.167.128.122
124	10.167.128.123/32	10.167.128.123 – 10.167.128.123	10.167.128.123
125	10.167.128.124/32	10.167.128.124 – 10.167.128.124	10.167.128.124
126	10.167.128.125/32	10.167.128.125 – 10.167.128.125	10.167.128.125
127	10.167.128.126/32	10.167.128.126 – 10.167.128.126	10.167.128.126
128	10.167.128.127/32	10.167.128.127 – 10.167.128.127	10.167.128.127

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 →