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)10.76.64.0/25

network10.76.64.0/25

broadcast10.76.64.127

first host10.76.64.1

last host10.76.64.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.76.64.0/25

address00001010.01001100.01000000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001100.01000000.00000000

broadcast00001010.01001100.01000000.01111111

green = network part, grey = host part

hex0x0a4c4000

decimal172769280

reverse dns0.64.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:4000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.64.0/32	10.76.64.0 – 10.76.64.0	10.76.64.0
2	10.76.64.1/32	10.76.64.1 – 10.76.64.1	10.76.64.1
3	10.76.64.2/32	10.76.64.2 – 10.76.64.2	10.76.64.2
4	10.76.64.3/32	10.76.64.3 – 10.76.64.3	10.76.64.3
5	10.76.64.4/32	10.76.64.4 – 10.76.64.4	10.76.64.4
6	10.76.64.5/32	10.76.64.5 – 10.76.64.5	10.76.64.5
7	10.76.64.6/32	10.76.64.6 – 10.76.64.6	10.76.64.6
8	10.76.64.7/32	10.76.64.7 – 10.76.64.7	10.76.64.7
9	10.76.64.8/32	10.76.64.8 – 10.76.64.8	10.76.64.8
10	10.76.64.9/32	10.76.64.9 – 10.76.64.9	10.76.64.9
11	10.76.64.10/32	10.76.64.10 – 10.76.64.10	10.76.64.10
12	10.76.64.11/32	10.76.64.11 – 10.76.64.11	10.76.64.11
13	10.76.64.12/32	10.76.64.12 – 10.76.64.12	10.76.64.12
14	10.76.64.13/32	10.76.64.13 – 10.76.64.13	10.76.64.13
15	10.76.64.14/32	10.76.64.14 – 10.76.64.14	10.76.64.14
16	10.76.64.15/32	10.76.64.15 – 10.76.64.15	10.76.64.15
17	10.76.64.16/32	10.76.64.16 – 10.76.64.16	10.76.64.16
18	10.76.64.17/32	10.76.64.17 – 10.76.64.17	10.76.64.17
19	10.76.64.18/32	10.76.64.18 – 10.76.64.18	10.76.64.18
20	10.76.64.19/32	10.76.64.19 – 10.76.64.19	10.76.64.19
21	10.76.64.20/32	10.76.64.20 – 10.76.64.20	10.76.64.20
22	10.76.64.21/32	10.76.64.21 – 10.76.64.21	10.76.64.21
23	10.76.64.22/32	10.76.64.22 – 10.76.64.22	10.76.64.22
24	10.76.64.23/32	10.76.64.23 – 10.76.64.23	10.76.64.23
25	10.76.64.24/32	10.76.64.24 – 10.76.64.24	10.76.64.24
26	10.76.64.25/32	10.76.64.25 – 10.76.64.25	10.76.64.25
27	10.76.64.26/32	10.76.64.26 – 10.76.64.26	10.76.64.26
28	10.76.64.27/32	10.76.64.27 – 10.76.64.27	10.76.64.27
29	10.76.64.28/32	10.76.64.28 – 10.76.64.28	10.76.64.28
30	10.76.64.29/32	10.76.64.29 – 10.76.64.29	10.76.64.29
31	10.76.64.30/32	10.76.64.30 – 10.76.64.30	10.76.64.30
32	10.76.64.31/32	10.76.64.31 – 10.76.64.31	10.76.64.31
33	10.76.64.32/32	10.76.64.32 – 10.76.64.32	10.76.64.32
34	10.76.64.33/32	10.76.64.33 – 10.76.64.33	10.76.64.33
35	10.76.64.34/32	10.76.64.34 – 10.76.64.34	10.76.64.34
36	10.76.64.35/32	10.76.64.35 – 10.76.64.35	10.76.64.35
37	10.76.64.36/32	10.76.64.36 – 10.76.64.36	10.76.64.36
38	10.76.64.37/32	10.76.64.37 – 10.76.64.37	10.76.64.37
39	10.76.64.38/32	10.76.64.38 – 10.76.64.38	10.76.64.38
40	10.76.64.39/32	10.76.64.39 – 10.76.64.39	10.76.64.39
41	10.76.64.40/32	10.76.64.40 – 10.76.64.40	10.76.64.40
42	10.76.64.41/32	10.76.64.41 – 10.76.64.41	10.76.64.41
43	10.76.64.42/32	10.76.64.42 – 10.76.64.42	10.76.64.42
44	10.76.64.43/32	10.76.64.43 – 10.76.64.43	10.76.64.43
45	10.76.64.44/32	10.76.64.44 – 10.76.64.44	10.76.64.44
46	10.76.64.45/32	10.76.64.45 – 10.76.64.45	10.76.64.45
47	10.76.64.46/32	10.76.64.46 – 10.76.64.46	10.76.64.46
48	10.76.64.47/32	10.76.64.47 – 10.76.64.47	10.76.64.47
49	10.76.64.48/32	10.76.64.48 – 10.76.64.48	10.76.64.48
50	10.76.64.49/32	10.76.64.49 – 10.76.64.49	10.76.64.49
51	10.76.64.50/32	10.76.64.50 – 10.76.64.50	10.76.64.50
52	10.76.64.51/32	10.76.64.51 – 10.76.64.51	10.76.64.51
53	10.76.64.52/32	10.76.64.52 – 10.76.64.52	10.76.64.52
54	10.76.64.53/32	10.76.64.53 – 10.76.64.53	10.76.64.53
55	10.76.64.54/32	10.76.64.54 – 10.76.64.54	10.76.64.54
56	10.76.64.55/32	10.76.64.55 – 10.76.64.55	10.76.64.55
57	10.76.64.56/32	10.76.64.56 – 10.76.64.56	10.76.64.56
58	10.76.64.57/32	10.76.64.57 – 10.76.64.57	10.76.64.57
59	10.76.64.58/32	10.76.64.58 – 10.76.64.58	10.76.64.58
60	10.76.64.59/32	10.76.64.59 – 10.76.64.59	10.76.64.59
61	10.76.64.60/32	10.76.64.60 – 10.76.64.60	10.76.64.60
62	10.76.64.61/32	10.76.64.61 – 10.76.64.61	10.76.64.61
63	10.76.64.62/32	10.76.64.62 – 10.76.64.62	10.76.64.62
64	10.76.64.63/32	10.76.64.63 – 10.76.64.63	10.76.64.63
65	10.76.64.64/32	10.76.64.64 – 10.76.64.64	10.76.64.64
66	10.76.64.65/32	10.76.64.65 – 10.76.64.65	10.76.64.65
67	10.76.64.66/32	10.76.64.66 – 10.76.64.66	10.76.64.66
68	10.76.64.67/32	10.76.64.67 – 10.76.64.67	10.76.64.67
69	10.76.64.68/32	10.76.64.68 – 10.76.64.68	10.76.64.68
70	10.76.64.69/32	10.76.64.69 – 10.76.64.69	10.76.64.69
71	10.76.64.70/32	10.76.64.70 – 10.76.64.70	10.76.64.70
72	10.76.64.71/32	10.76.64.71 – 10.76.64.71	10.76.64.71
73	10.76.64.72/32	10.76.64.72 – 10.76.64.72	10.76.64.72
74	10.76.64.73/32	10.76.64.73 – 10.76.64.73	10.76.64.73
75	10.76.64.74/32	10.76.64.74 – 10.76.64.74	10.76.64.74
76	10.76.64.75/32	10.76.64.75 – 10.76.64.75	10.76.64.75
77	10.76.64.76/32	10.76.64.76 – 10.76.64.76	10.76.64.76
78	10.76.64.77/32	10.76.64.77 – 10.76.64.77	10.76.64.77
79	10.76.64.78/32	10.76.64.78 – 10.76.64.78	10.76.64.78
80	10.76.64.79/32	10.76.64.79 – 10.76.64.79	10.76.64.79
81	10.76.64.80/32	10.76.64.80 – 10.76.64.80	10.76.64.80
82	10.76.64.81/32	10.76.64.81 – 10.76.64.81	10.76.64.81
83	10.76.64.82/32	10.76.64.82 – 10.76.64.82	10.76.64.82
84	10.76.64.83/32	10.76.64.83 – 10.76.64.83	10.76.64.83
85	10.76.64.84/32	10.76.64.84 – 10.76.64.84	10.76.64.84
86	10.76.64.85/32	10.76.64.85 – 10.76.64.85	10.76.64.85
87	10.76.64.86/32	10.76.64.86 – 10.76.64.86	10.76.64.86
88	10.76.64.87/32	10.76.64.87 – 10.76.64.87	10.76.64.87
89	10.76.64.88/32	10.76.64.88 – 10.76.64.88	10.76.64.88
90	10.76.64.89/32	10.76.64.89 – 10.76.64.89	10.76.64.89
91	10.76.64.90/32	10.76.64.90 – 10.76.64.90	10.76.64.90
92	10.76.64.91/32	10.76.64.91 – 10.76.64.91	10.76.64.91
93	10.76.64.92/32	10.76.64.92 – 10.76.64.92	10.76.64.92
94	10.76.64.93/32	10.76.64.93 – 10.76.64.93	10.76.64.93
95	10.76.64.94/32	10.76.64.94 – 10.76.64.94	10.76.64.94
96	10.76.64.95/32	10.76.64.95 – 10.76.64.95	10.76.64.95
97	10.76.64.96/32	10.76.64.96 – 10.76.64.96	10.76.64.96
98	10.76.64.97/32	10.76.64.97 – 10.76.64.97	10.76.64.97
99	10.76.64.98/32	10.76.64.98 – 10.76.64.98	10.76.64.98
100	10.76.64.99/32	10.76.64.99 – 10.76.64.99	10.76.64.99
101	10.76.64.100/32	10.76.64.100 – 10.76.64.100	10.76.64.100
102	10.76.64.101/32	10.76.64.101 – 10.76.64.101	10.76.64.101
103	10.76.64.102/32	10.76.64.102 – 10.76.64.102	10.76.64.102
104	10.76.64.103/32	10.76.64.103 – 10.76.64.103	10.76.64.103
105	10.76.64.104/32	10.76.64.104 – 10.76.64.104	10.76.64.104
106	10.76.64.105/32	10.76.64.105 – 10.76.64.105	10.76.64.105
107	10.76.64.106/32	10.76.64.106 – 10.76.64.106	10.76.64.106
108	10.76.64.107/32	10.76.64.107 – 10.76.64.107	10.76.64.107
109	10.76.64.108/32	10.76.64.108 – 10.76.64.108	10.76.64.108
110	10.76.64.109/32	10.76.64.109 – 10.76.64.109	10.76.64.109
111	10.76.64.110/32	10.76.64.110 – 10.76.64.110	10.76.64.110
112	10.76.64.111/32	10.76.64.111 – 10.76.64.111	10.76.64.111
113	10.76.64.112/32	10.76.64.112 – 10.76.64.112	10.76.64.112
114	10.76.64.113/32	10.76.64.113 – 10.76.64.113	10.76.64.113
115	10.76.64.114/32	10.76.64.114 – 10.76.64.114	10.76.64.114
116	10.76.64.115/32	10.76.64.115 – 10.76.64.115	10.76.64.115
117	10.76.64.116/32	10.76.64.116 – 10.76.64.116	10.76.64.116
118	10.76.64.117/32	10.76.64.117 – 10.76.64.117	10.76.64.117
119	10.76.64.118/32	10.76.64.118 – 10.76.64.118	10.76.64.118
120	10.76.64.119/32	10.76.64.119 – 10.76.64.119	10.76.64.119
121	10.76.64.120/32	10.76.64.120 – 10.76.64.120	10.76.64.120
122	10.76.64.121/32	10.76.64.121 – 10.76.64.121	10.76.64.121
123	10.76.64.122/32	10.76.64.122 – 10.76.64.122	10.76.64.122
124	10.76.64.123/32	10.76.64.123 – 10.76.64.123	10.76.64.123
125	10.76.64.124/32	10.76.64.124 – 10.76.64.124	10.76.64.124
126	10.76.64.125/32	10.76.64.125 – 10.76.64.125	10.76.64.125
127	10.76.64.126/32	10.76.64.126 – 10.76.64.126	10.76.64.126
128	10.76.64.127/32	10.76.64.127 – 10.76.64.127	10.76.64.127

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 →