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)10.71.74.0/25

network10.71.74.0/25

broadcast10.71.74.127

first host10.71.74.1

last host10.71.74.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.71.74.0/25

address00001010.01000111.01001010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01000111.01001010.00000000

broadcast00001010.01000111.01001010.01111111

green = network part, grey = host part

hex0x0a474a00

decimal172444160

reverse dns0.74.71.10.in-addr.arpa

ipv4-mapped::ffff:a47:4a00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.71.74.0/32	10.71.74.0 – 10.71.74.0	10.71.74.0
2	10.71.74.1/32	10.71.74.1 – 10.71.74.1	10.71.74.1
3	10.71.74.2/32	10.71.74.2 – 10.71.74.2	10.71.74.2
4	10.71.74.3/32	10.71.74.3 – 10.71.74.3	10.71.74.3
5	10.71.74.4/32	10.71.74.4 – 10.71.74.4	10.71.74.4
6	10.71.74.5/32	10.71.74.5 – 10.71.74.5	10.71.74.5
7	10.71.74.6/32	10.71.74.6 – 10.71.74.6	10.71.74.6
8	10.71.74.7/32	10.71.74.7 – 10.71.74.7	10.71.74.7
9	10.71.74.8/32	10.71.74.8 – 10.71.74.8	10.71.74.8
10	10.71.74.9/32	10.71.74.9 – 10.71.74.9	10.71.74.9
11	10.71.74.10/32	10.71.74.10 – 10.71.74.10	10.71.74.10
12	10.71.74.11/32	10.71.74.11 – 10.71.74.11	10.71.74.11
13	10.71.74.12/32	10.71.74.12 – 10.71.74.12	10.71.74.12
14	10.71.74.13/32	10.71.74.13 – 10.71.74.13	10.71.74.13
15	10.71.74.14/32	10.71.74.14 – 10.71.74.14	10.71.74.14
16	10.71.74.15/32	10.71.74.15 – 10.71.74.15	10.71.74.15
17	10.71.74.16/32	10.71.74.16 – 10.71.74.16	10.71.74.16
18	10.71.74.17/32	10.71.74.17 – 10.71.74.17	10.71.74.17
19	10.71.74.18/32	10.71.74.18 – 10.71.74.18	10.71.74.18
20	10.71.74.19/32	10.71.74.19 – 10.71.74.19	10.71.74.19
21	10.71.74.20/32	10.71.74.20 – 10.71.74.20	10.71.74.20
22	10.71.74.21/32	10.71.74.21 – 10.71.74.21	10.71.74.21
23	10.71.74.22/32	10.71.74.22 – 10.71.74.22	10.71.74.22
24	10.71.74.23/32	10.71.74.23 – 10.71.74.23	10.71.74.23
25	10.71.74.24/32	10.71.74.24 – 10.71.74.24	10.71.74.24
26	10.71.74.25/32	10.71.74.25 – 10.71.74.25	10.71.74.25
27	10.71.74.26/32	10.71.74.26 – 10.71.74.26	10.71.74.26
28	10.71.74.27/32	10.71.74.27 – 10.71.74.27	10.71.74.27
29	10.71.74.28/32	10.71.74.28 – 10.71.74.28	10.71.74.28
30	10.71.74.29/32	10.71.74.29 – 10.71.74.29	10.71.74.29
31	10.71.74.30/32	10.71.74.30 – 10.71.74.30	10.71.74.30
32	10.71.74.31/32	10.71.74.31 – 10.71.74.31	10.71.74.31
33	10.71.74.32/32	10.71.74.32 – 10.71.74.32	10.71.74.32
34	10.71.74.33/32	10.71.74.33 – 10.71.74.33	10.71.74.33
35	10.71.74.34/32	10.71.74.34 – 10.71.74.34	10.71.74.34
36	10.71.74.35/32	10.71.74.35 – 10.71.74.35	10.71.74.35
37	10.71.74.36/32	10.71.74.36 – 10.71.74.36	10.71.74.36
38	10.71.74.37/32	10.71.74.37 – 10.71.74.37	10.71.74.37
39	10.71.74.38/32	10.71.74.38 – 10.71.74.38	10.71.74.38
40	10.71.74.39/32	10.71.74.39 – 10.71.74.39	10.71.74.39
41	10.71.74.40/32	10.71.74.40 – 10.71.74.40	10.71.74.40
42	10.71.74.41/32	10.71.74.41 – 10.71.74.41	10.71.74.41
43	10.71.74.42/32	10.71.74.42 – 10.71.74.42	10.71.74.42
44	10.71.74.43/32	10.71.74.43 – 10.71.74.43	10.71.74.43
45	10.71.74.44/32	10.71.74.44 – 10.71.74.44	10.71.74.44
46	10.71.74.45/32	10.71.74.45 – 10.71.74.45	10.71.74.45
47	10.71.74.46/32	10.71.74.46 – 10.71.74.46	10.71.74.46
48	10.71.74.47/32	10.71.74.47 – 10.71.74.47	10.71.74.47
49	10.71.74.48/32	10.71.74.48 – 10.71.74.48	10.71.74.48
50	10.71.74.49/32	10.71.74.49 – 10.71.74.49	10.71.74.49
51	10.71.74.50/32	10.71.74.50 – 10.71.74.50	10.71.74.50
52	10.71.74.51/32	10.71.74.51 – 10.71.74.51	10.71.74.51
53	10.71.74.52/32	10.71.74.52 – 10.71.74.52	10.71.74.52
54	10.71.74.53/32	10.71.74.53 – 10.71.74.53	10.71.74.53
55	10.71.74.54/32	10.71.74.54 – 10.71.74.54	10.71.74.54
56	10.71.74.55/32	10.71.74.55 – 10.71.74.55	10.71.74.55
57	10.71.74.56/32	10.71.74.56 – 10.71.74.56	10.71.74.56
58	10.71.74.57/32	10.71.74.57 – 10.71.74.57	10.71.74.57
59	10.71.74.58/32	10.71.74.58 – 10.71.74.58	10.71.74.58
60	10.71.74.59/32	10.71.74.59 – 10.71.74.59	10.71.74.59
61	10.71.74.60/32	10.71.74.60 – 10.71.74.60	10.71.74.60
62	10.71.74.61/32	10.71.74.61 – 10.71.74.61	10.71.74.61
63	10.71.74.62/32	10.71.74.62 – 10.71.74.62	10.71.74.62
64	10.71.74.63/32	10.71.74.63 – 10.71.74.63	10.71.74.63
65	10.71.74.64/32	10.71.74.64 – 10.71.74.64	10.71.74.64
66	10.71.74.65/32	10.71.74.65 – 10.71.74.65	10.71.74.65
67	10.71.74.66/32	10.71.74.66 – 10.71.74.66	10.71.74.66
68	10.71.74.67/32	10.71.74.67 – 10.71.74.67	10.71.74.67
69	10.71.74.68/32	10.71.74.68 – 10.71.74.68	10.71.74.68
70	10.71.74.69/32	10.71.74.69 – 10.71.74.69	10.71.74.69
71	10.71.74.70/32	10.71.74.70 – 10.71.74.70	10.71.74.70
72	10.71.74.71/32	10.71.74.71 – 10.71.74.71	10.71.74.71
73	10.71.74.72/32	10.71.74.72 – 10.71.74.72	10.71.74.72
74	10.71.74.73/32	10.71.74.73 – 10.71.74.73	10.71.74.73
75	10.71.74.74/32	10.71.74.74 – 10.71.74.74	10.71.74.74
76	10.71.74.75/32	10.71.74.75 – 10.71.74.75	10.71.74.75
77	10.71.74.76/32	10.71.74.76 – 10.71.74.76	10.71.74.76
78	10.71.74.77/32	10.71.74.77 – 10.71.74.77	10.71.74.77
79	10.71.74.78/32	10.71.74.78 – 10.71.74.78	10.71.74.78
80	10.71.74.79/32	10.71.74.79 – 10.71.74.79	10.71.74.79
81	10.71.74.80/32	10.71.74.80 – 10.71.74.80	10.71.74.80
82	10.71.74.81/32	10.71.74.81 – 10.71.74.81	10.71.74.81
83	10.71.74.82/32	10.71.74.82 – 10.71.74.82	10.71.74.82
84	10.71.74.83/32	10.71.74.83 – 10.71.74.83	10.71.74.83
85	10.71.74.84/32	10.71.74.84 – 10.71.74.84	10.71.74.84
86	10.71.74.85/32	10.71.74.85 – 10.71.74.85	10.71.74.85
87	10.71.74.86/32	10.71.74.86 – 10.71.74.86	10.71.74.86
88	10.71.74.87/32	10.71.74.87 – 10.71.74.87	10.71.74.87
89	10.71.74.88/32	10.71.74.88 – 10.71.74.88	10.71.74.88
90	10.71.74.89/32	10.71.74.89 – 10.71.74.89	10.71.74.89
91	10.71.74.90/32	10.71.74.90 – 10.71.74.90	10.71.74.90
92	10.71.74.91/32	10.71.74.91 – 10.71.74.91	10.71.74.91
93	10.71.74.92/32	10.71.74.92 – 10.71.74.92	10.71.74.92
94	10.71.74.93/32	10.71.74.93 – 10.71.74.93	10.71.74.93
95	10.71.74.94/32	10.71.74.94 – 10.71.74.94	10.71.74.94
96	10.71.74.95/32	10.71.74.95 – 10.71.74.95	10.71.74.95
97	10.71.74.96/32	10.71.74.96 – 10.71.74.96	10.71.74.96
98	10.71.74.97/32	10.71.74.97 – 10.71.74.97	10.71.74.97
99	10.71.74.98/32	10.71.74.98 – 10.71.74.98	10.71.74.98
100	10.71.74.99/32	10.71.74.99 – 10.71.74.99	10.71.74.99
101	10.71.74.100/32	10.71.74.100 – 10.71.74.100	10.71.74.100
102	10.71.74.101/32	10.71.74.101 – 10.71.74.101	10.71.74.101
103	10.71.74.102/32	10.71.74.102 – 10.71.74.102	10.71.74.102
104	10.71.74.103/32	10.71.74.103 – 10.71.74.103	10.71.74.103
105	10.71.74.104/32	10.71.74.104 – 10.71.74.104	10.71.74.104
106	10.71.74.105/32	10.71.74.105 – 10.71.74.105	10.71.74.105
107	10.71.74.106/32	10.71.74.106 – 10.71.74.106	10.71.74.106
108	10.71.74.107/32	10.71.74.107 – 10.71.74.107	10.71.74.107
109	10.71.74.108/32	10.71.74.108 – 10.71.74.108	10.71.74.108
110	10.71.74.109/32	10.71.74.109 – 10.71.74.109	10.71.74.109
111	10.71.74.110/32	10.71.74.110 – 10.71.74.110	10.71.74.110
112	10.71.74.111/32	10.71.74.111 – 10.71.74.111	10.71.74.111
113	10.71.74.112/32	10.71.74.112 – 10.71.74.112	10.71.74.112
114	10.71.74.113/32	10.71.74.113 – 10.71.74.113	10.71.74.113
115	10.71.74.114/32	10.71.74.114 – 10.71.74.114	10.71.74.114
116	10.71.74.115/32	10.71.74.115 – 10.71.74.115	10.71.74.115
117	10.71.74.116/32	10.71.74.116 – 10.71.74.116	10.71.74.116
118	10.71.74.117/32	10.71.74.117 – 10.71.74.117	10.71.74.117
119	10.71.74.118/32	10.71.74.118 – 10.71.74.118	10.71.74.118
120	10.71.74.119/32	10.71.74.119 – 10.71.74.119	10.71.74.119
121	10.71.74.120/32	10.71.74.120 – 10.71.74.120	10.71.74.120
122	10.71.74.121/32	10.71.74.121 – 10.71.74.121	10.71.74.121
123	10.71.74.122/32	10.71.74.122 – 10.71.74.122	10.71.74.122
124	10.71.74.123/32	10.71.74.123 – 10.71.74.123	10.71.74.123
125	10.71.74.124/32	10.71.74.124 – 10.71.74.124	10.71.74.124
126	10.71.74.125/32	10.71.74.125 – 10.71.74.125	10.71.74.125
127	10.71.74.126/32	10.71.74.126 – 10.71.74.126	10.71.74.126
128	10.71.74.127/32	10.71.74.127 – 10.71.74.127	10.71.74.127

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 →