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)10.76.17.0/25

network10.76.17.0/25

broadcast10.76.17.127

first host10.76.17.1

last host10.76.17.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.76.17.0/25

address00001010.01001100.00010001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001100.00010001.00000000

broadcast00001010.01001100.00010001.01111111

green = network part, grey = host part

hex0x0a4c1100

decimal172757248

reverse dns0.17.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:1100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.17.0/32	10.76.17.0 – 10.76.17.0	10.76.17.0
2	10.76.17.1/32	10.76.17.1 – 10.76.17.1	10.76.17.1
3	10.76.17.2/32	10.76.17.2 – 10.76.17.2	10.76.17.2
4	10.76.17.3/32	10.76.17.3 – 10.76.17.3	10.76.17.3
5	10.76.17.4/32	10.76.17.4 – 10.76.17.4	10.76.17.4
6	10.76.17.5/32	10.76.17.5 – 10.76.17.5	10.76.17.5
7	10.76.17.6/32	10.76.17.6 – 10.76.17.6	10.76.17.6
8	10.76.17.7/32	10.76.17.7 – 10.76.17.7	10.76.17.7
9	10.76.17.8/32	10.76.17.8 – 10.76.17.8	10.76.17.8
10	10.76.17.9/32	10.76.17.9 – 10.76.17.9	10.76.17.9
11	10.76.17.10/32	10.76.17.10 – 10.76.17.10	10.76.17.10
12	10.76.17.11/32	10.76.17.11 – 10.76.17.11	10.76.17.11
13	10.76.17.12/32	10.76.17.12 – 10.76.17.12	10.76.17.12
14	10.76.17.13/32	10.76.17.13 – 10.76.17.13	10.76.17.13
15	10.76.17.14/32	10.76.17.14 – 10.76.17.14	10.76.17.14
16	10.76.17.15/32	10.76.17.15 – 10.76.17.15	10.76.17.15
17	10.76.17.16/32	10.76.17.16 – 10.76.17.16	10.76.17.16
18	10.76.17.17/32	10.76.17.17 – 10.76.17.17	10.76.17.17
19	10.76.17.18/32	10.76.17.18 – 10.76.17.18	10.76.17.18
20	10.76.17.19/32	10.76.17.19 – 10.76.17.19	10.76.17.19
21	10.76.17.20/32	10.76.17.20 – 10.76.17.20	10.76.17.20
22	10.76.17.21/32	10.76.17.21 – 10.76.17.21	10.76.17.21
23	10.76.17.22/32	10.76.17.22 – 10.76.17.22	10.76.17.22
24	10.76.17.23/32	10.76.17.23 – 10.76.17.23	10.76.17.23
25	10.76.17.24/32	10.76.17.24 – 10.76.17.24	10.76.17.24
26	10.76.17.25/32	10.76.17.25 – 10.76.17.25	10.76.17.25
27	10.76.17.26/32	10.76.17.26 – 10.76.17.26	10.76.17.26
28	10.76.17.27/32	10.76.17.27 – 10.76.17.27	10.76.17.27
29	10.76.17.28/32	10.76.17.28 – 10.76.17.28	10.76.17.28
30	10.76.17.29/32	10.76.17.29 – 10.76.17.29	10.76.17.29
31	10.76.17.30/32	10.76.17.30 – 10.76.17.30	10.76.17.30
32	10.76.17.31/32	10.76.17.31 – 10.76.17.31	10.76.17.31
33	10.76.17.32/32	10.76.17.32 – 10.76.17.32	10.76.17.32
34	10.76.17.33/32	10.76.17.33 – 10.76.17.33	10.76.17.33
35	10.76.17.34/32	10.76.17.34 – 10.76.17.34	10.76.17.34
36	10.76.17.35/32	10.76.17.35 – 10.76.17.35	10.76.17.35
37	10.76.17.36/32	10.76.17.36 – 10.76.17.36	10.76.17.36
38	10.76.17.37/32	10.76.17.37 – 10.76.17.37	10.76.17.37
39	10.76.17.38/32	10.76.17.38 – 10.76.17.38	10.76.17.38
40	10.76.17.39/32	10.76.17.39 – 10.76.17.39	10.76.17.39
41	10.76.17.40/32	10.76.17.40 – 10.76.17.40	10.76.17.40
42	10.76.17.41/32	10.76.17.41 – 10.76.17.41	10.76.17.41
43	10.76.17.42/32	10.76.17.42 – 10.76.17.42	10.76.17.42
44	10.76.17.43/32	10.76.17.43 – 10.76.17.43	10.76.17.43
45	10.76.17.44/32	10.76.17.44 – 10.76.17.44	10.76.17.44
46	10.76.17.45/32	10.76.17.45 – 10.76.17.45	10.76.17.45
47	10.76.17.46/32	10.76.17.46 – 10.76.17.46	10.76.17.46
48	10.76.17.47/32	10.76.17.47 – 10.76.17.47	10.76.17.47
49	10.76.17.48/32	10.76.17.48 – 10.76.17.48	10.76.17.48
50	10.76.17.49/32	10.76.17.49 – 10.76.17.49	10.76.17.49
51	10.76.17.50/32	10.76.17.50 – 10.76.17.50	10.76.17.50
52	10.76.17.51/32	10.76.17.51 – 10.76.17.51	10.76.17.51
53	10.76.17.52/32	10.76.17.52 – 10.76.17.52	10.76.17.52
54	10.76.17.53/32	10.76.17.53 – 10.76.17.53	10.76.17.53
55	10.76.17.54/32	10.76.17.54 – 10.76.17.54	10.76.17.54
56	10.76.17.55/32	10.76.17.55 – 10.76.17.55	10.76.17.55
57	10.76.17.56/32	10.76.17.56 – 10.76.17.56	10.76.17.56
58	10.76.17.57/32	10.76.17.57 – 10.76.17.57	10.76.17.57
59	10.76.17.58/32	10.76.17.58 – 10.76.17.58	10.76.17.58
60	10.76.17.59/32	10.76.17.59 – 10.76.17.59	10.76.17.59
61	10.76.17.60/32	10.76.17.60 – 10.76.17.60	10.76.17.60
62	10.76.17.61/32	10.76.17.61 – 10.76.17.61	10.76.17.61
63	10.76.17.62/32	10.76.17.62 – 10.76.17.62	10.76.17.62
64	10.76.17.63/32	10.76.17.63 – 10.76.17.63	10.76.17.63
65	10.76.17.64/32	10.76.17.64 – 10.76.17.64	10.76.17.64
66	10.76.17.65/32	10.76.17.65 – 10.76.17.65	10.76.17.65
67	10.76.17.66/32	10.76.17.66 – 10.76.17.66	10.76.17.66
68	10.76.17.67/32	10.76.17.67 – 10.76.17.67	10.76.17.67
69	10.76.17.68/32	10.76.17.68 – 10.76.17.68	10.76.17.68
70	10.76.17.69/32	10.76.17.69 – 10.76.17.69	10.76.17.69
71	10.76.17.70/32	10.76.17.70 – 10.76.17.70	10.76.17.70
72	10.76.17.71/32	10.76.17.71 – 10.76.17.71	10.76.17.71
73	10.76.17.72/32	10.76.17.72 – 10.76.17.72	10.76.17.72
74	10.76.17.73/32	10.76.17.73 – 10.76.17.73	10.76.17.73
75	10.76.17.74/32	10.76.17.74 – 10.76.17.74	10.76.17.74
76	10.76.17.75/32	10.76.17.75 – 10.76.17.75	10.76.17.75
77	10.76.17.76/32	10.76.17.76 – 10.76.17.76	10.76.17.76
78	10.76.17.77/32	10.76.17.77 – 10.76.17.77	10.76.17.77
79	10.76.17.78/32	10.76.17.78 – 10.76.17.78	10.76.17.78
80	10.76.17.79/32	10.76.17.79 – 10.76.17.79	10.76.17.79
81	10.76.17.80/32	10.76.17.80 – 10.76.17.80	10.76.17.80
82	10.76.17.81/32	10.76.17.81 – 10.76.17.81	10.76.17.81
83	10.76.17.82/32	10.76.17.82 – 10.76.17.82	10.76.17.82
84	10.76.17.83/32	10.76.17.83 – 10.76.17.83	10.76.17.83
85	10.76.17.84/32	10.76.17.84 – 10.76.17.84	10.76.17.84
86	10.76.17.85/32	10.76.17.85 – 10.76.17.85	10.76.17.85
87	10.76.17.86/32	10.76.17.86 – 10.76.17.86	10.76.17.86
88	10.76.17.87/32	10.76.17.87 – 10.76.17.87	10.76.17.87
89	10.76.17.88/32	10.76.17.88 – 10.76.17.88	10.76.17.88
90	10.76.17.89/32	10.76.17.89 – 10.76.17.89	10.76.17.89
91	10.76.17.90/32	10.76.17.90 – 10.76.17.90	10.76.17.90
92	10.76.17.91/32	10.76.17.91 – 10.76.17.91	10.76.17.91
93	10.76.17.92/32	10.76.17.92 – 10.76.17.92	10.76.17.92
94	10.76.17.93/32	10.76.17.93 – 10.76.17.93	10.76.17.93
95	10.76.17.94/32	10.76.17.94 – 10.76.17.94	10.76.17.94
96	10.76.17.95/32	10.76.17.95 – 10.76.17.95	10.76.17.95
97	10.76.17.96/32	10.76.17.96 – 10.76.17.96	10.76.17.96
98	10.76.17.97/32	10.76.17.97 – 10.76.17.97	10.76.17.97
99	10.76.17.98/32	10.76.17.98 – 10.76.17.98	10.76.17.98
100	10.76.17.99/32	10.76.17.99 – 10.76.17.99	10.76.17.99
101	10.76.17.100/32	10.76.17.100 – 10.76.17.100	10.76.17.100
102	10.76.17.101/32	10.76.17.101 – 10.76.17.101	10.76.17.101
103	10.76.17.102/32	10.76.17.102 – 10.76.17.102	10.76.17.102
104	10.76.17.103/32	10.76.17.103 – 10.76.17.103	10.76.17.103
105	10.76.17.104/32	10.76.17.104 – 10.76.17.104	10.76.17.104
106	10.76.17.105/32	10.76.17.105 – 10.76.17.105	10.76.17.105
107	10.76.17.106/32	10.76.17.106 – 10.76.17.106	10.76.17.106
108	10.76.17.107/32	10.76.17.107 – 10.76.17.107	10.76.17.107
109	10.76.17.108/32	10.76.17.108 – 10.76.17.108	10.76.17.108
110	10.76.17.109/32	10.76.17.109 – 10.76.17.109	10.76.17.109
111	10.76.17.110/32	10.76.17.110 – 10.76.17.110	10.76.17.110
112	10.76.17.111/32	10.76.17.111 – 10.76.17.111	10.76.17.111
113	10.76.17.112/32	10.76.17.112 – 10.76.17.112	10.76.17.112
114	10.76.17.113/32	10.76.17.113 – 10.76.17.113	10.76.17.113
115	10.76.17.114/32	10.76.17.114 – 10.76.17.114	10.76.17.114
116	10.76.17.115/32	10.76.17.115 – 10.76.17.115	10.76.17.115
117	10.76.17.116/32	10.76.17.116 – 10.76.17.116	10.76.17.116
118	10.76.17.117/32	10.76.17.117 – 10.76.17.117	10.76.17.117
119	10.76.17.118/32	10.76.17.118 – 10.76.17.118	10.76.17.118
120	10.76.17.119/32	10.76.17.119 – 10.76.17.119	10.76.17.119
121	10.76.17.120/32	10.76.17.120 – 10.76.17.120	10.76.17.120
122	10.76.17.121/32	10.76.17.121 – 10.76.17.121	10.76.17.121
123	10.76.17.122/32	10.76.17.122 – 10.76.17.122	10.76.17.122
124	10.76.17.123/32	10.76.17.123 – 10.76.17.123	10.76.17.123
125	10.76.17.124/32	10.76.17.124 – 10.76.17.124	10.76.17.124
126	10.76.17.125/32	10.76.17.125 – 10.76.17.125	10.76.17.125
127	10.76.17.126/32	10.76.17.126 – 10.76.17.126	10.76.17.126
128	10.76.17.127/32	10.76.17.127 – 10.76.17.127	10.76.17.127

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 →