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)10.167.243.0/25

network10.167.243.0/25

broadcast10.167.243.127

first host10.167.243.1

last host10.167.243.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.243.0/25

address00001010.10100111.11110011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11110011.00000000

broadcast00001010.10100111.11110011.01111111

green = network part, grey = host part

hex0x0aa7f300

decimal178778880

reverse dns0.243.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:f300

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.243.0/32	10.167.243.0 – 10.167.243.0	10.167.243.0
2	10.167.243.1/32	10.167.243.1 – 10.167.243.1	10.167.243.1
3	10.167.243.2/32	10.167.243.2 – 10.167.243.2	10.167.243.2
4	10.167.243.3/32	10.167.243.3 – 10.167.243.3	10.167.243.3
5	10.167.243.4/32	10.167.243.4 – 10.167.243.4	10.167.243.4
6	10.167.243.5/32	10.167.243.5 – 10.167.243.5	10.167.243.5
7	10.167.243.6/32	10.167.243.6 – 10.167.243.6	10.167.243.6
8	10.167.243.7/32	10.167.243.7 – 10.167.243.7	10.167.243.7
9	10.167.243.8/32	10.167.243.8 – 10.167.243.8	10.167.243.8
10	10.167.243.9/32	10.167.243.9 – 10.167.243.9	10.167.243.9
11	10.167.243.10/32	10.167.243.10 – 10.167.243.10	10.167.243.10
12	10.167.243.11/32	10.167.243.11 – 10.167.243.11	10.167.243.11
13	10.167.243.12/32	10.167.243.12 – 10.167.243.12	10.167.243.12
14	10.167.243.13/32	10.167.243.13 – 10.167.243.13	10.167.243.13
15	10.167.243.14/32	10.167.243.14 – 10.167.243.14	10.167.243.14
16	10.167.243.15/32	10.167.243.15 – 10.167.243.15	10.167.243.15
17	10.167.243.16/32	10.167.243.16 – 10.167.243.16	10.167.243.16
18	10.167.243.17/32	10.167.243.17 – 10.167.243.17	10.167.243.17
19	10.167.243.18/32	10.167.243.18 – 10.167.243.18	10.167.243.18
20	10.167.243.19/32	10.167.243.19 – 10.167.243.19	10.167.243.19
21	10.167.243.20/32	10.167.243.20 – 10.167.243.20	10.167.243.20
22	10.167.243.21/32	10.167.243.21 – 10.167.243.21	10.167.243.21
23	10.167.243.22/32	10.167.243.22 – 10.167.243.22	10.167.243.22
24	10.167.243.23/32	10.167.243.23 – 10.167.243.23	10.167.243.23
25	10.167.243.24/32	10.167.243.24 – 10.167.243.24	10.167.243.24
26	10.167.243.25/32	10.167.243.25 – 10.167.243.25	10.167.243.25
27	10.167.243.26/32	10.167.243.26 – 10.167.243.26	10.167.243.26
28	10.167.243.27/32	10.167.243.27 – 10.167.243.27	10.167.243.27
29	10.167.243.28/32	10.167.243.28 – 10.167.243.28	10.167.243.28
30	10.167.243.29/32	10.167.243.29 – 10.167.243.29	10.167.243.29
31	10.167.243.30/32	10.167.243.30 – 10.167.243.30	10.167.243.30
32	10.167.243.31/32	10.167.243.31 – 10.167.243.31	10.167.243.31
33	10.167.243.32/32	10.167.243.32 – 10.167.243.32	10.167.243.32
34	10.167.243.33/32	10.167.243.33 – 10.167.243.33	10.167.243.33
35	10.167.243.34/32	10.167.243.34 – 10.167.243.34	10.167.243.34
36	10.167.243.35/32	10.167.243.35 – 10.167.243.35	10.167.243.35
37	10.167.243.36/32	10.167.243.36 – 10.167.243.36	10.167.243.36
38	10.167.243.37/32	10.167.243.37 – 10.167.243.37	10.167.243.37
39	10.167.243.38/32	10.167.243.38 – 10.167.243.38	10.167.243.38
40	10.167.243.39/32	10.167.243.39 – 10.167.243.39	10.167.243.39
41	10.167.243.40/32	10.167.243.40 – 10.167.243.40	10.167.243.40
42	10.167.243.41/32	10.167.243.41 – 10.167.243.41	10.167.243.41
43	10.167.243.42/32	10.167.243.42 – 10.167.243.42	10.167.243.42
44	10.167.243.43/32	10.167.243.43 – 10.167.243.43	10.167.243.43
45	10.167.243.44/32	10.167.243.44 – 10.167.243.44	10.167.243.44
46	10.167.243.45/32	10.167.243.45 – 10.167.243.45	10.167.243.45
47	10.167.243.46/32	10.167.243.46 – 10.167.243.46	10.167.243.46
48	10.167.243.47/32	10.167.243.47 – 10.167.243.47	10.167.243.47
49	10.167.243.48/32	10.167.243.48 – 10.167.243.48	10.167.243.48
50	10.167.243.49/32	10.167.243.49 – 10.167.243.49	10.167.243.49
51	10.167.243.50/32	10.167.243.50 – 10.167.243.50	10.167.243.50
52	10.167.243.51/32	10.167.243.51 – 10.167.243.51	10.167.243.51
53	10.167.243.52/32	10.167.243.52 – 10.167.243.52	10.167.243.52
54	10.167.243.53/32	10.167.243.53 – 10.167.243.53	10.167.243.53
55	10.167.243.54/32	10.167.243.54 – 10.167.243.54	10.167.243.54
56	10.167.243.55/32	10.167.243.55 – 10.167.243.55	10.167.243.55
57	10.167.243.56/32	10.167.243.56 – 10.167.243.56	10.167.243.56
58	10.167.243.57/32	10.167.243.57 – 10.167.243.57	10.167.243.57
59	10.167.243.58/32	10.167.243.58 – 10.167.243.58	10.167.243.58
60	10.167.243.59/32	10.167.243.59 – 10.167.243.59	10.167.243.59
61	10.167.243.60/32	10.167.243.60 – 10.167.243.60	10.167.243.60
62	10.167.243.61/32	10.167.243.61 – 10.167.243.61	10.167.243.61
63	10.167.243.62/32	10.167.243.62 – 10.167.243.62	10.167.243.62
64	10.167.243.63/32	10.167.243.63 – 10.167.243.63	10.167.243.63
65	10.167.243.64/32	10.167.243.64 – 10.167.243.64	10.167.243.64
66	10.167.243.65/32	10.167.243.65 – 10.167.243.65	10.167.243.65
67	10.167.243.66/32	10.167.243.66 – 10.167.243.66	10.167.243.66
68	10.167.243.67/32	10.167.243.67 – 10.167.243.67	10.167.243.67
69	10.167.243.68/32	10.167.243.68 – 10.167.243.68	10.167.243.68
70	10.167.243.69/32	10.167.243.69 – 10.167.243.69	10.167.243.69
71	10.167.243.70/32	10.167.243.70 – 10.167.243.70	10.167.243.70
72	10.167.243.71/32	10.167.243.71 – 10.167.243.71	10.167.243.71
73	10.167.243.72/32	10.167.243.72 – 10.167.243.72	10.167.243.72
74	10.167.243.73/32	10.167.243.73 – 10.167.243.73	10.167.243.73
75	10.167.243.74/32	10.167.243.74 – 10.167.243.74	10.167.243.74
76	10.167.243.75/32	10.167.243.75 – 10.167.243.75	10.167.243.75
77	10.167.243.76/32	10.167.243.76 – 10.167.243.76	10.167.243.76
78	10.167.243.77/32	10.167.243.77 – 10.167.243.77	10.167.243.77
79	10.167.243.78/32	10.167.243.78 – 10.167.243.78	10.167.243.78
80	10.167.243.79/32	10.167.243.79 – 10.167.243.79	10.167.243.79
81	10.167.243.80/32	10.167.243.80 – 10.167.243.80	10.167.243.80
82	10.167.243.81/32	10.167.243.81 – 10.167.243.81	10.167.243.81
83	10.167.243.82/32	10.167.243.82 – 10.167.243.82	10.167.243.82
84	10.167.243.83/32	10.167.243.83 – 10.167.243.83	10.167.243.83
85	10.167.243.84/32	10.167.243.84 – 10.167.243.84	10.167.243.84
86	10.167.243.85/32	10.167.243.85 – 10.167.243.85	10.167.243.85
87	10.167.243.86/32	10.167.243.86 – 10.167.243.86	10.167.243.86
88	10.167.243.87/32	10.167.243.87 – 10.167.243.87	10.167.243.87
89	10.167.243.88/32	10.167.243.88 – 10.167.243.88	10.167.243.88
90	10.167.243.89/32	10.167.243.89 – 10.167.243.89	10.167.243.89
91	10.167.243.90/32	10.167.243.90 – 10.167.243.90	10.167.243.90
92	10.167.243.91/32	10.167.243.91 – 10.167.243.91	10.167.243.91
93	10.167.243.92/32	10.167.243.92 – 10.167.243.92	10.167.243.92
94	10.167.243.93/32	10.167.243.93 – 10.167.243.93	10.167.243.93
95	10.167.243.94/32	10.167.243.94 – 10.167.243.94	10.167.243.94
96	10.167.243.95/32	10.167.243.95 – 10.167.243.95	10.167.243.95
97	10.167.243.96/32	10.167.243.96 – 10.167.243.96	10.167.243.96
98	10.167.243.97/32	10.167.243.97 – 10.167.243.97	10.167.243.97
99	10.167.243.98/32	10.167.243.98 – 10.167.243.98	10.167.243.98
100	10.167.243.99/32	10.167.243.99 – 10.167.243.99	10.167.243.99
101	10.167.243.100/32	10.167.243.100 – 10.167.243.100	10.167.243.100
102	10.167.243.101/32	10.167.243.101 – 10.167.243.101	10.167.243.101
103	10.167.243.102/32	10.167.243.102 – 10.167.243.102	10.167.243.102
104	10.167.243.103/32	10.167.243.103 – 10.167.243.103	10.167.243.103
105	10.167.243.104/32	10.167.243.104 – 10.167.243.104	10.167.243.104
106	10.167.243.105/32	10.167.243.105 – 10.167.243.105	10.167.243.105
107	10.167.243.106/32	10.167.243.106 – 10.167.243.106	10.167.243.106
108	10.167.243.107/32	10.167.243.107 – 10.167.243.107	10.167.243.107
109	10.167.243.108/32	10.167.243.108 – 10.167.243.108	10.167.243.108
110	10.167.243.109/32	10.167.243.109 – 10.167.243.109	10.167.243.109
111	10.167.243.110/32	10.167.243.110 – 10.167.243.110	10.167.243.110
112	10.167.243.111/32	10.167.243.111 – 10.167.243.111	10.167.243.111
113	10.167.243.112/32	10.167.243.112 – 10.167.243.112	10.167.243.112
114	10.167.243.113/32	10.167.243.113 – 10.167.243.113	10.167.243.113
115	10.167.243.114/32	10.167.243.114 – 10.167.243.114	10.167.243.114
116	10.167.243.115/32	10.167.243.115 – 10.167.243.115	10.167.243.115
117	10.167.243.116/32	10.167.243.116 – 10.167.243.116	10.167.243.116
118	10.167.243.117/32	10.167.243.117 – 10.167.243.117	10.167.243.117
119	10.167.243.118/32	10.167.243.118 – 10.167.243.118	10.167.243.118
120	10.167.243.119/32	10.167.243.119 – 10.167.243.119	10.167.243.119
121	10.167.243.120/32	10.167.243.120 – 10.167.243.120	10.167.243.120
122	10.167.243.121/32	10.167.243.121 – 10.167.243.121	10.167.243.121
123	10.167.243.122/32	10.167.243.122 – 10.167.243.122	10.167.243.122
124	10.167.243.123/32	10.167.243.123 – 10.167.243.123	10.167.243.123
125	10.167.243.124/32	10.167.243.124 – 10.167.243.124	10.167.243.124
126	10.167.243.125/32	10.167.243.125 – 10.167.243.125	10.167.243.125
127	10.167.243.126/32	10.167.243.126 – 10.167.243.126	10.167.243.126
128	10.167.243.127/32	10.167.243.127 – 10.167.243.127	10.167.243.127

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 →