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)10.0.118.0/25

network10.0.118.0/25

broadcast10.0.118.127

first host10.0.118.1

last host10.0.118.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.118.0/25

address00001010.00000000.01110110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01110110.00000000

broadcast00001010.00000000.01110110.01111111

green = network part, grey = host part

hex0x0a007600

decimal167802368

reverse dns0.118.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7600

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.118.0/32	10.0.118.0 – 10.0.118.0	10.0.118.0
2	10.0.118.1/32	10.0.118.1 – 10.0.118.1	10.0.118.1
3	10.0.118.2/32	10.0.118.2 – 10.0.118.2	10.0.118.2
4	10.0.118.3/32	10.0.118.3 – 10.0.118.3	10.0.118.3
5	10.0.118.4/32	10.0.118.4 – 10.0.118.4	10.0.118.4
6	10.0.118.5/32	10.0.118.5 – 10.0.118.5	10.0.118.5
7	10.0.118.6/32	10.0.118.6 – 10.0.118.6	10.0.118.6
8	10.0.118.7/32	10.0.118.7 – 10.0.118.7	10.0.118.7
9	10.0.118.8/32	10.0.118.8 – 10.0.118.8	10.0.118.8
10	10.0.118.9/32	10.0.118.9 – 10.0.118.9	10.0.118.9
11	10.0.118.10/32	10.0.118.10 – 10.0.118.10	10.0.118.10
12	10.0.118.11/32	10.0.118.11 – 10.0.118.11	10.0.118.11
13	10.0.118.12/32	10.0.118.12 – 10.0.118.12	10.0.118.12
14	10.0.118.13/32	10.0.118.13 – 10.0.118.13	10.0.118.13
15	10.0.118.14/32	10.0.118.14 – 10.0.118.14	10.0.118.14
16	10.0.118.15/32	10.0.118.15 – 10.0.118.15	10.0.118.15
17	10.0.118.16/32	10.0.118.16 – 10.0.118.16	10.0.118.16
18	10.0.118.17/32	10.0.118.17 – 10.0.118.17	10.0.118.17
19	10.0.118.18/32	10.0.118.18 – 10.0.118.18	10.0.118.18
20	10.0.118.19/32	10.0.118.19 – 10.0.118.19	10.0.118.19
21	10.0.118.20/32	10.0.118.20 – 10.0.118.20	10.0.118.20
22	10.0.118.21/32	10.0.118.21 – 10.0.118.21	10.0.118.21
23	10.0.118.22/32	10.0.118.22 – 10.0.118.22	10.0.118.22
24	10.0.118.23/32	10.0.118.23 – 10.0.118.23	10.0.118.23
25	10.0.118.24/32	10.0.118.24 – 10.0.118.24	10.0.118.24
26	10.0.118.25/32	10.0.118.25 – 10.0.118.25	10.0.118.25
27	10.0.118.26/32	10.0.118.26 – 10.0.118.26	10.0.118.26
28	10.0.118.27/32	10.0.118.27 – 10.0.118.27	10.0.118.27
29	10.0.118.28/32	10.0.118.28 – 10.0.118.28	10.0.118.28
30	10.0.118.29/32	10.0.118.29 – 10.0.118.29	10.0.118.29
31	10.0.118.30/32	10.0.118.30 – 10.0.118.30	10.0.118.30
32	10.0.118.31/32	10.0.118.31 – 10.0.118.31	10.0.118.31
33	10.0.118.32/32	10.0.118.32 – 10.0.118.32	10.0.118.32
34	10.0.118.33/32	10.0.118.33 – 10.0.118.33	10.0.118.33
35	10.0.118.34/32	10.0.118.34 – 10.0.118.34	10.0.118.34
36	10.0.118.35/32	10.0.118.35 – 10.0.118.35	10.0.118.35
37	10.0.118.36/32	10.0.118.36 – 10.0.118.36	10.0.118.36
38	10.0.118.37/32	10.0.118.37 – 10.0.118.37	10.0.118.37
39	10.0.118.38/32	10.0.118.38 – 10.0.118.38	10.0.118.38
40	10.0.118.39/32	10.0.118.39 – 10.0.118.39	10.0.118.39
41	10.0.118.40/32	10.0.118.40 – 10.0.118.40	10.0.118.40
42	10.0.118.41/32	10.0.118.41 – 10.0.118.41	10.0.118.41
43	10.0.118.42/32	10.0.118.42 – 10.0.118.42	10.0.118.42
44	10.0.118.43/32	10.0.118.43 – 10.0.118.43	10.0.118.43
45	10.0.118.44/32	10.0.118.44 – 10.0.118.44	10.0.118.44
46	10.0.118.45/32	10.0.118.45 – 10.0.118.45	10.0.118.45
47	10.0.118.46/32	10.0.118.46 – 10.0.118.46	10.0.118.46
48	10.0.118.47/32	10.0.118.47 – 10.0.118.47	10.0.118.47
49	10.0.118.48/32	10.0.118.48 – 10.0.118.48	10.0.118.48
50	10.0.118.49/32	10.0.118.49 – 10.0.118.49	10.0.118.49
51	10.0.118.50/32	10.0.118.50 – 10.0.118.50	10.0.118.50
52	10.0.118.51/32	10.0.118.51 – 10.0.118.51	10.0.118.51
53	10.0.118.52/32	10.0.118.52 – 10.0.118.52	10.0.118.52
54	10.0.118.53/32	10.0.118.53 – 10.0.118.53	10.0.118.53
55	10.0.118.54/32	10.0.118.54 – 10.0.118.54	10.0.118.54
56	10.0.118.55/32	10.0.118.55 – 10.0.118.55	10.0.118.55
57	10.0.118.56/32	10.0.118.56 – 10.0.118.56	10.0.118.56
58	10.0.118.57/32	10.0.118.57 – 10.0.118.57	10.0.118.57
59	10.0.118.58/32	10.0.118.58 – 10.0.118.58	10.0.118.58
60	10.0.118.59/32	10.0.118.59 – 10.0.118.59	10.0.118.59
61	10.0.118.60/32	10.0.118.60 – 10.0.118.60	10.0.118.60
62	10.0.118.61/32	10.0.118.61 – 10.0.118.61	10.0.118.61
63	10.0.118.62/32	10.0.118.62 – 10.0.118.62	10.0.118.62
64	10.0.118.63/32	10.0.118.63 – 10.0.118.63	10.0.118.63
65	10.0.118.64/32	10.0.118.64 – 10.0.118.64	10.0.118.64
66	10.0.118.65/32	10.0.118.65 – 10.0.118.65	10.0.118.65
67	10.0.118.66/32	10.0.118.66 – 10.0.118.66	10.0.118.66
68	10.0.118.67/32	10.0.118.67 – 10.0.118.67	10.0.118.67
69	10.0.118.68/32	10.0.118.68 – 10.0.118.68	10.0.118.68
70	10.0.118.69/32	10.0.118.69 – 10.0.118.69	10.0.118.69
71	10.0.118.70/32	10.0.118.70 – 10.0.118.70	10.0.118.70
72	10.0.118.71/32	10.0.118.71 – 10.0.118.71	10.0.118.71
73	10.0.118.72/32	10.0.118.72 – 10.0.118.72	10.0.118.72
74	10.0.118.73/32	10.0.118.73 – 10.0.118.73	10.0.118.73
75	10.0.118.74/32	10.0.118.74 – 10.0.118.74	10.0.118.74
76	10.0.118.75/32	10.0.118.75 – 10.0.118.75	10.0.118.75
77	10.0.118.76/32	10.0.118.76 – 10.0.118.76	10.0.118.76
78	10.0.118.77/32	10.0.118.77 – 10.0.118.77	10.0.118.77
79	10.0.118.78/32	10.0.118.78 – 10.0.118.78	10.0.118.78
80	10.0.118.79/32	10.0.118.79 – 10.0.118.79	10.0.118.79
81	10.0.118.80/32	10.0.118.80 – 10.0.118.80	10.0.118.80
82	10.0.118.81/32	10.0.118.81 – 10.0.118.81	10.0.118.81
83	10.0.118.82/32	10.0.118.82 – 10.0.118.82	10.0.118.82
84	10.0.118.83/32	10.0.118.83 – 10.0.118.83	10.0.118.83
85	10.0.118.84/32	10.0.118.84 – 10.0.118.84	10.0.118.84
86	10.0.118.85/32	10.0.118.85 – 10.0.118.85	10.0.118.85
87	10.0.118.86/32	10.0.118.86 – 10.0.118.86	10.0.118.86
88	10.0.118.87/32	10.0.118.87 – 10.0.118.87	10.0.118.87
89	10.0.118.88/32	10.0.118.88 – 10.0.118.88	10.0.118.88
90	10.0.118.89/32	10.0.118.89 – 10.0.118.89	10.0.118.89
91	10.0.118.90/32	10.0.118.90 – 10.0.118.90	10.0.118.90
92	10.0.118.91/32	10.0.118.91 – 10.0.118.91	10.0.118.91
93	10.0.118.92/32	10.0.118.92 – 10.0.118.92	10.0.118.92
94	10.0.118.93/32	10.0.118.93 – 10.0.118.93	10.0.118.93
95	10.0.118.94/32	10.0.118.94 – 10.0.118.94	10.0.118.94
96	10.0.118.95/32	10.0.118.95 – 10.0.118.95	10.0.118.95
97	10.0.118.96/32	10.0.118.96 – 10.0.118.96	10.0.118.96
98	10.0.118.97/32	10.0.118.97 – 10.0.118.97	10.0.118.97
99	10.0.118.98/32	10.0.118.98 – 10.0.118.98	10.0.118.98
100	10.0.118.99/32	10.0.118.99 – 10.0.118.99	10.0.118.99
101	10.0.118.100/32	10.0.118.100 – 10.0.118.100	10.0.118.100
102	10.0.118.101/32	10.0.118.101 – 10.0.118.101	10.0.118.101
103	10.0.118.102/32	10.0.118.102 – 10.0.118.102	10.0.118.102
104	10.0.118.103/32	10.0.118.103 – 10.0.118.103	10.0.118.103
105	10.0.118.104/32	10.0.118.104 – 10.0.118.104	10.0.118.104
106	10.0.118.105/32	10.0.118.105 – 10.0.118.105	10.0.118.105
107	10.0.118.106/32	10.0.118.106 – 10.0.118.106	10.0.118.106
108	10.0.118.107/32	10.0.118.107 – 10.0.118.107	10.0.118.107
109	10.0.118.108/32	10.0.118.108 – 10.0.118.108	10.0.118.108
110	10.0.118.109/32	10.0.118.109 – 10.0.118.109	10.0.118.109
111	10.0.118.110/32	10.0.118.110 – 10.0.118.110	10.0.118.110
112	10.0.118.111/32	10.0.118.111 – 10.0.118.111	10.0.118.111
113	10.0.118.112/32	10.0.118.112 – 10.0.118.112	10.0.118.112
114	10.0.118.113/32	10.0.118.113 – 10.0.118.113	10.0.118.113
115	10.0.118.114/32	10.0.118.114 – 10.0.118.114	10.0.118.114
116	10.0.118.115/32	10.0.118.115 – 10.0.118.115	10.0.118.115
117	10.0.118.116/32	10.0.118.116 – 10.0.118.116	10.0.118.116
118	10.0.118.117/32	10.0.118.117 – 10.0.118.117	10.0.118.117
119	10.0.118.118/32	10.0.118.118 – 10.0.118.118	10.0.118.118
120	10.0.118.119/32	10.0.118.119 – 10.0.118.119	10.0.118.119
121	10.0.118.120/32	10.0.118.120 – 10.0.118.120	10.0.118.120
122	10.0.118.121/32	10.0.118.121 – 10.0.118.121	10.0.118.121
123	10.0.118.122/32	10.0.118.122 – 10.0.118.122	10.0.118.122
124	10.0.118.123/32	10.0.118.123 – 10.0.118.123	10.0.118.123
125	10.0.118.124/32	10.0.118.124 – 10.0.118.124	10.0.118.124
126	10.0.118.125/32	10.0.118.125 – 10.0.118.125	10.0.118.125
127	10.0.118.126/32	10.0.118.126 – 10.0.118.126	10.0.118.126
128	10.0.118.127/32	10.0.118.127 – 10.0.118.127	10.0.118.127

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 →