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)10.76.16.0/25

network10.76.16.0/25

broadcast10.76.16.127

first host10.76.16.1

last host10.76.16.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.76.16.0/25

address00001010.01001100.00010000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001100.00010000.00000000

broadcast00001010.01001100.00010000.01111111

green = network part, grey = host part

hex0x0a4c1000

decimal172756992

reverse dns0.16.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:1000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.16.0/32	10.76.16.0 – 10.76.16.0	10.76.16.0
2	10.76.16.1/32	10.76.16.1 – 10.76.16.1	10.76.16.1
3	10.76.16.2/32	10.76.16.2 – 10.76.16.2	10.76.16.2
4	10.76.16.3/32	10.76.16.3 – 10.76.16.3	10.76.16.3
5	10.76.16.4/32	10.76.16.4 – 10.76.16.4	10.76.16.4
6	10.76.16.5/32	10.76.16.5 – 10.76.16.5	10.76.16.5
7	10.76.16.6/32	10.76.16.6 – 10.76.16.6	10.76.16.6
8	10.76.16.7/32	10.76.16.7 – 10.76.16.7	10.76.16.7
9	10.76.16.8/32	10.76.16.8 – 10.76.16.8	10.76.16.8
10	10.76.16.9/32	10.76.16.9 – 10.76.16.9	10.76.16.9
11	10.76.16.10/32	10.76.16.10 – 10.76.16.10	10.76.16.10
12	10.76.16.11/32	10.76.16.11 – 10.76.16.11	10.76.16.11
13	10.76.16.12/32	10.76.16.12 – 10.76.16.12	10.76.16.12
14	10.76.16.13/32	10.76.16.13 – 10.76.16.13	10.76.16.13
15	10.76.16.14/32	10.76.16.14 – 10.76.16.14	10.76.16.14
16	10.76.16.15/32	10.76.16.15 – 10.76.16.15	10.76.16.15
17	10.76.16.16/32	10.76.16.16 – 10.76.16.16	10.76.16.16
18	10.76.16.17/32	10.76.16.17 – 10.76.16.17	10.76.16.17
19	10.76.16.18/32	10.76.16.18 – 10.76.16.18	10.76.16.18
20	10.76.16.19/32	10.76.16.19 – 10.76.16.19	10.76.16.19
21	10.76.16.20/32	10.76.16.20 – 10.76.16.20	10.76.16.20
22	10.76.16.21/32	10.76.16.21 – 10.76.16.21	10.76.16.21
23	10.76.16.22/32	10.76.16.22 – 10.76.16.22	10.76.16.22
24	10.76.16.23/32	10.76.16.23 – 10.76.16.23	10.76.16.23
25	10.76.16.24/32	10.76.16.24 – 10.76.16.24	10.76.16.24
26	10.76.16.25/32	10.76.16.25 – 10.76.16.25	10.76.16.25
27	10.76.16.26/32	10.76.16.26 – 10.76.16.26	10.76.16.26
28	10.76.16.27/32	10.76.16.27 – 10.76.16.27	10.76.16.27
29	10.76.16.28/32	10.76.16.28 – 10.76.16.28	10.76.16.28
30	10.76.16.29/32	10.76.16.29 – 10.76.16.29	10.76.16.29
31	10.76.16.30/32	10.76.16.30 – 10.76.16.30	10.76.16.30
32	10.76.16.31/32	10.76.16.31 – 10.76.16.31	10.76.16.31
33	10.76.16.32/32	10.76.16.32 – 10.76.16.32	10.76.16.32
34	10.76.16.33/32	10.76.16.33 – 10.76.16.33	10.76.16.33
35	10.76.16.34/32	10.76.16.34 – 10.76.16.34	10.76.16.34
36	10.76.16.35/32	10.76.16.35 – 10.76.16.35	10.76.16.35
37	10.76.16.36/32	10.76.16.36 – 10.76.16.36	10.76.16.36
38	10.76.16.37/32	10.76.16.37 – 10.76.16.37	10.76.16.37
39	10.76.16.38/32	10.76.16.38 – 10.76.16.38	10.76.16.38
40	10.76.16.39/32	10.76.16.39 – 10.76.16.39	10.76.16.39
41	10.76.16.40/32	10.76.16.40 – 10.76.16.40	10.76.16.40
42	10.76.16.41/32	10.76.16.41 – 10.76.16.41	10.76.16.41
43	10.76.16.42/32	10.76.16.42 – 10.76.16.42	10.76.16.42
44	10.76.16.43/32	10.76.16.43 – 10.76.16.43	10.76.16.43
45	10.76.16.44/32	10.76.16.44 – 10.76.16.44	10.76.16.44
46	10.76.16.45/32	10.76.16.45 – 10.76.16.45	10.76.16.45
47	10.76.16.46/32	10.76.16.46 – 10.76.16.46	10.76.16.46
48	10.76.16.47/32	10.76.16.47 – 10.76.16.47	10.76.16.47
49	10.76.16.48/32	10.76.16.48 – 10.76.16.48	10.76.16.48
50	10.76.16.49/32	10.76.16.49 – 10.76.16.49	10.76.16.49
51	10.76.16.50/32	10.76.16.50 – 10.76.16.50	10.76.16.50
52	10.76.16.51/32	10.76.16.51 – 10.76.16.51	10.76.16.51
53	10.76.16.52/32	10.76.16.52 – 10.76.16.52	10.76.16.52
54	10.76.16.53/32	10.76.16.53 – 10.76.16.53	10.76.16.53
55	10.76.16.54/32	10.76.16.54 – 10.76.16.54	10.76.16.54
56	10.76.16.55/32	10.76.16.55 – 10.76.16.55	10.76.16.55
57	10.76.16.56/32	10.76.16.56 – 10.76.16.56	10.76.16.56
58	10.76.16.57/32	10.76.16.57 – 10.76.16.57	10.76.16.57
59	10.76.16.58/32	10.76.16.58 – 10.76.16.58	10.76.16.58
60	10.76.16.59/32	10.76.16.59 – 10.76.16.59	10.76.16.59
61	10.76.16.60/32	10.76.16.60 – 10.76.16.60	10.76.16.60
62	10.76.16.61/32	10.76.16.61 – 10.76.16.61	10.76.16.61
63	10.76.16.62/32	10.76.16.62 – 10.76.16.62	10.76.16.62
64	10.76.16.63/32	10.76.16.63 – 10.76.16.63	10.76.16.63
65	10.76.16.64/32	10.76.16.64 – 10.76.16.64	10.76.16.64
66	10.76.16.65/32	10.76.16.65 – 10.76.16.65	10.76.16.65
67	10.76.16.66/32	10.76.16.66 – 10.76.16.66	10.76.16.66
68	10.76.16.67/32	10.76.16.67 – 10.76.16.67	10.76.16.67
69	10.76.16.68/32	10.76.16.68 – 10.76.16.68	10.76.16.68
70	10.76.16.69/32	10.76.16.69 – 10.76.16.69	10.76.16.69
71	10.76.16.70/32	10.76.16.70 – 10.76.16.70	10.76.16.70
72	10.76.16.71/32	10.76.16.71 – 10.76.16.71	10.76.16.71
73	10.76.16.72/32	10.76.16.72 – 10.76.16.72	10.76.16.72
74	10.76.16.73/32	10.76.16.73 – 10.76.16.73	10.76.16.73
75	10.76.16.74/32	10.76.16.74 – 10.76.16.74	10.76.16.74
76	10.76.16.75/32	10.76.16.75 – 10.76.16.75	10.76.16.75
77	10.76.16.76/32	10.76.16.76 – 10.76.16.76	10.76.16.76
78	10.76.16.77/32	10.76.16.77 – 10.76.16.77	10.76.16.77
79	10.76.16.78/32	10.76.16.78 – 10.76.16.78	10.76.16.78
80	10.76.16.79/32	10.76.16.79 – 10.76.16.79	10.76.16.79
81	10.76.16.80/32	10.76.16.80 – 10.76.16.80	10.76.16.80
82	10.76.16.81/32	10.76.16.81 – 10.76.16.81	10.76.16.81
83	10.76.16.82/32	10.76.16.82 – 10.76.16.82	10.76.16.82
84	10.76.16.83/32	10.76.16.83 – 10.76.16.83	10.76.16.83
85	10.76.16.84/32	10.76.16.84 – 10.76.16.84	10.76.16.84
86	10.76.16.85/32	10.76.16.85 – 10.76.16.85	10.76.16.85
87	10.76.16.86/32	10.76.16.86 – 10.76.16.86	10.76.16.86
88	10.76.16.87/32	10.76.16.87 – 10.76.16.87	10.76.16.87
89	10.76.16.88/32	10.76.16.88 – 10.76.16.88	10.76.16.88
90	10.76.16.89/32	10.76.16.89 – 10.76.16.89	10.76.16.89
91	10.76.16.90/32	10.76.16.90 – 10.76.16.90	10.76.16.90
92	10.76.16.91/32	10.76.16.91 – 10.76.16.91	10.76.16.91
93	10.76.16.92/32	10.76.16.92 – 10.76.16.92	10.76.16.92
94	10.76.16.93/32	10.76.16.93 – 10.76.16.93	10.76.16.93
95	10.76.16.94/32	10.76.16.94 – 10.76.16.94	10.76.16.94
96	10.76.16.95/32	10.76.16.95 – 10.76.16.95	10.76.16.95
97	10.76.16.96/32	10.76.16.96 – 10.76.16.96	10.76.16.96
98	10.76.16.97/32	10.76.16.97 – 10.76.16.97	10.76.16.97
99	10.76.16.98/32	10.76.16.98 – 10.76.16.98	10.76.16.98
100	10.76.16.99/32	10.76.16.99 – 10.76.16.99	10.76.16.99
101	10.76.16.100/32	10.76.16.100 – 10.76.16.100	10.76.16.100
102	10.76.16.101/32	10.76.16.101 – 10.76.16.101	10.76.16.101
103	10.76.16.102/32	10.76.16.102 – 10.76.16.102	10.76.16.102
104	10.76.16.103/32	10.76.16.103 – 10.76.16.103	10.76.16.103
105	10.76.16.104/32	10.76.16.104 – 10.76.16.104	10.76.16.104
106	10.76.16.105/32	10.76.16.105 – 10.76.16.105	10.76.16.105
107	10.76.16.106/32	10.76.16.106 – 10.76.16.106	10.76.16.106
108	10.76.16.107/32	10.76.16.107 – 10.76.16.107	10.76.16.107
109	10.76.16.108/32	10.76.16.108 – 10.76.16.108	10.76.16.108
110	10.76.16.109/32	10.76.16.109 – 10.76.16.109	10.76.16.109
111	10.76.16.110/32	10.76.16.110 – 10.76.16.110	10.76.16.110
112	10.76.16.111/32	10.76.16.111 – 10.76.16.111	10.76.16.111
113	10.76.16.112/32	10.76.16.112 – 10.76.16.112	10.76.16.112
114	10.76.16.113/32	10.76.16.113 – 10.76.16.113	10.76.16.113
115	10.76.16.114/32	10.76.16.114 – 10.76.16.114	10.76.16.114
116	10.76.16.115/32	10.76.16.115 – 10.76.16.115	10.76.16.115
117	10.76.16.116/32	10.76.16.116 – 10.76.16.116	10.76.16.116
118	10.76.16.117/32	10.76.16.117 – 10.76.16.117	10.76.16.117
119	10.76.16.118/32	10.76.16.118 – 10.76.16.118	10.76.16.118
120	10.76.16.119/32	10.76.16.119 – 10.76.16.119	10.76.16.119
121	10.76.16.120/32	10.76.16.120 – 10.76.16.120	10.76.16.120
122	10.76.16.121/32	10.76.16.121 – 10.76.16.121	10.76.16.121
123	10.76.16.122/32	10.76.16.122 – 10.76.16.122	10.76.16.122
124	10.76.16.123/32	10.76.16.123 – 10.76.16.123	10.76.16.123
125	10.76.16.124/32	10.76.16.124 – 10.76.16.124	10.76.16.124
126	10.76.16.125/32	10.76.16.125 – 10.76.16.125	10.76.16.125
127	10.76.16.126/32	10.76.16.126 – 10.76.16.126	10.76.16.126
128	10.76.16.127/32	10.76.16.127 – 10.76.16.127	10.76.16.127

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 →