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)10.45.32.0/25

network10.45.32.0/25

broadcast10.45.32.127

first host10.45.32.1

last host10.45.32.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.45.32.0/25

address00001010.00101101.00100000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00101101.00100000.00000000

broadcast00001010.00101101.00100000.01111111

green = network part, grey = host part

hex0x0a2d2000

decimal170729472

reverse dns0.32.45.10.in-addr.arpa

ipv4-mapped::ffff:a2d:2000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.45.32.0/32	10.45.32.0 – 10.45.32.0	10.45.32.0
2	10.45.32.1/32	10.45.32.1 – 10.45.32.1	10.45.32.1
3	10.45.32.2/32	10.45.32.2 – 10.45.32.2	10.45.32.2
4	10.45.32.3/32	10.45.32.3 – 10.45.32.3	10.45.32.3
5	10.45.32.4/32	10.45.32.4 – 10.45.32.4	10.45.32.4
6	10.45.32.5/32	10.45.32.5 – 10.45.32.5	10.45.32.5
7	10.45.32.6/32	10.45.32.6 – 10.45.32.6	10.45.32.6
8	10.45.32.7/32	10.45.32.7 – 10.45.32.7	10.45.32.7
9	10.45.32.8/32	10.45.32.8 – 10.45.32.8	10.45.32.8
10	10.45.32.9/32	10.45.32.9 – 10.45.32.9	10.45.32.9
11	10.45.32.10/32	10.45.32.10 – 10.45.32.10	10.45.32.10
12	10.45.32.11/32	10.45.32.11 – 10.45.32.11	10.45.32.11
13	10.45.32.12/32	10.45.32.12 – 10.45.32.12	10.45.32.12
14	10.45.32.13/32	10.45.32.13 – 10.45.32.13	10.45.32.13
15	10.45.32.14/32	10.45.32.14 – 10.45.32.14	10.45.32.14
16	10.45.32.15/32	10.45.32.15 – 10.45.32.15	10.45.32.15
17	10.45.32.16/32	10.45.32.16 – 10.45.32.16	10.45.32.16
18	10.45.32.17/32	10.45.32.17 – 10.45.32.17	10.45.32.17
19	10.45.32.18/32	10.45.32.18 – 10.45.32.18	10.45.32.18
20	10.45.32.19/32	10.45.32.19 – 10.45.32.19	10.45.32.19
21	10.45.32.20/32	10.45.32.20 – 10.45.32.20	10.45.32.20
22	10.45.32.21/32	10.45.32.21 – 10.45.32.21	10.45.32.21
23	10.45.32.22/32	10.45.32.22 – 10.45.32.22	10.45.32.22
24	10.45.32.23/32	10.45.32.23 – 10.45.32.23	10.45.32.23
25	10.45.32.24/32	10.45.32.24 – 10.45.32.24	10.45.32.24
26	10.45.32.25/32	10.45.32.25 – 10.45.32.25	10.45.32.25
27	10.45.32.26/32	10.45.32.26 – 10.45.32.26	10.45.32.26
28	10.45.32.27/32	10.45.32.27 – 10.45.32.27	10.45.32.27
29	10.45.32.28/32	10.45.32.28 – 10.45.32.28	10.45.32.28
30	10.45.32.29/32	10.45.32.29 – 10.45.32.29	10.45.32.29
31	10.45.32.30/32	10.45.32.30 – 10.45.32.30	10.45.32.30
32	10.45.32.31/32	10.45.32.31 – 10.45.32.31	10.45.32.31
33	10.45.32.32/32	10.45.32.32 – 10.45.32.32	10.45.32.32
34	10.45.32.33/32	10.45.32.33 – 10.45.32.33	10.45.32.33
35	10.45.32.34/32	10.45.32.34 – 10.45.32.34	10.45.32.34
36	10.45.32.35/32	10.45.32.35 – 10.45.32.35	10.45.32.35
37	10.45.32.36/32	10.45.32.36 – 10.45.32.36	10.45.32.36
38	10.45.32.37/32	10.45.32.37 – 10.45.32.37	10.45.32.37
39	10.45.32.38/32	10.45.32.38 – 10.45.32.38	10.45.32.38
40	10.45.32.39/32	10.45.32.39 – 10.45.32.39	10.45.32.39
41	10.45.32.40/32	10.45.32.40 – 10.45.32.40	10.45.32.40
42	10.45.32.41/32	10.45.32.41 – 10.45.32.41	10.45.32.41
43	10.45.32.42/32	10.45.32.42 – 10.45.32.42	10.45.32.42
44	10.45.32.43/32	10.45.32.43 – 10.45.32.43	10.45.32.43
45	10.45.32.44/32	10.45.32.44 – 10.45.32.44	10.45.32.44
46	10.45.32.45/32	10.45.32.45 – 10.45.32.45	10.45.32.45
47	10.45.32.46/32	10.45.32.46 – 10.45.32.46	10.45.32.46
48	10.45.32.47/32	10.45.32.47 – 10.45.32.47	10.45.32.47
49	10.45.32.48/32	10.45.32.48 – 10.45.32.48	10.45.32.48
50	10.45.32.49/32	10.45.32.49 – 10.45.32.49	10.45.32.49
51	10.45.32.50/32	10.45.32.50 – 10.45.32.50	10.45.32.50
52	10.45.32.51/32	10.45.32.51 – 10.45.32.51	10.45.32.51
53	10.45.32.52/32	10.45.32.52 – 10.45.32.52	10.45.32.52
54	10.45.32.53/32	10.45.32.53 – 10.45.32.53	10.45.32.53
55	10.45.32.54/32	10.45.32.54 – 10.45.32.54	10.45.32.54
56	10.45.32.55/32	10.45.32.55 – 10.45.32.55	10.45.32.55
57	10.45.32.56/32	10.45.32.56 – 10.45.32.56	10.45.32.56
58	10.45.32.57/32	10.45.32.57 – 10.45.32.57	10.45.32.57
59	10.45.32.58/32	10.45.32.58 – 10.45.32.58	10.45.32.58
60	10.45.32.59/32	10.45.32.59 – 10.45.32.59	10.45.32.59
61	10.45.32.60/32	10.45.32.60 – 10.45.32.60	10.45.32.60
62	10.45.32.61/32	10.45.32.61 – 10.45.32.61	10.45.32.61
63	10.45.32.62/32	10.45.32.62 – 10.45.32.62	10.45.32.62
64	10.45.32.63/32	10.45.32.63 – 10.45.32.63	10.45.32.63
65	10.45.32.64/32	10.45.32.64 – 10.45.32.64	10.45.32.64
66	10.45.32.65/32	10.45.32.65 – 10.45.32.65	10.45.32.65
67	10.45.32.66/32	10.45.32.66 – 10.45.32.66	10.45.32.66
68	10.45.32.67/32	10.45.32.67 – 10.45.32.67	10.45.32.67
69	10.45.32.68/32	10.45.32.68 – 10.45.32.68	10.45.32.68
70	10.45.32.69/32	10.45.32.69 – 10.45.32.69	10.45.32.69
71	10.45.32.70/32	10.45.32.70 – 10.45.32.70	10.45.32.70
72	10.45.32.71/32	10.45.32.71 – 10.45.32.71	10.45.32.71
73	10.45.32.72/32	10.45.32.72 – 10.45.32.72	10.45.32.72
74	10.45.32.73/32	10.45.32.73 – 10.45.32.73	10.45.32.73
75	10.45.32.74/32	10.45.32.74 – 10.45.32.74	10.45.32.74
76	10.45.32.75/32	10.45.32.75 – 10.45.32.75	10.45.32.75
77	10.45.32.76/32	10.45.32.76 – 10.45.32.76	10.45.32.76
78	10.45.32.77/32	10.45.32.77 – 10.45.32.77	10.45.32.77
79	10.45.32.78/32	10.45.32.78 – 10.45.32.78	10.45.32.78
80	10.45.32.79/32	10.45.32.79 – 10.45.32.79	10.45.32.79
81	10.45.32.80/32	10.45.32.80 – 10.45.32.80	10.45.32.80
82	10.45.32.81/32	10.45.32.81 – 10.45.32.81	10.45.32.81
83	10.45.32.82/32	10.45.32.82 – 10.45.32.82	10.45.32.82
84	10.45.32.83/32	10.45.32.83 – 10.45.32.83	10.45.32.83
85	10.45.32.84/32	10.45.32.84 – 10.45.32.84	10.45.32.84
86	10.45.32.85/32	10.45.32.85 – 10.45.32.85	10.45.32.85
87	10.45.32.86/32	10.45.32.86 – 10.45.32.86	10.45.32.86
88	10.45.32.87/32	10.45.32.87 – 10.45.32.87	10.45.32.87
89	10.45.32.88/32	10.45.32.88 – 10.45.32.88	10.45.32.88
90	10.45.32.89/32	10.45.32.89 – 10.45.32.89	10.45.32.89
91	10.45.32.90/32	10.45.32.90 – 10.45.32.90	10.45.32.90
92	10.45.32.91/32	10.45.32.91 – 10.45.32.91	10.45.32.91
93	10.45.32.92/32	10.45.32.92 – 10.45.32.92	10.45.32.92
94	10.45.32.93/32	10.45.32.93 – 10.45.32.93	10.45.32.93
95	10.45.32.94/32	10.45.32.94 – 10.45.32.94	10.45.32.94
96	10.45.32.95/32	10.45.32.95 – 10.45.32.95	10.45.32.95
97	10.45.32.96/32	10.45.32.96 – 10.45.32.96	10.45.32.96
98	10.45.32.97/32	10.45.32.97 – 10.45.32.97	10.45.32.97
99	10.45.32.98/32	10.45.32.98 – 10.45.32.98	10.45.32.98
100	10.45.32.99/32	10.45.32.99 – 10.45.32.99	10.45.32.99
101	10.45.32.100/32	10.45.32.100 – 10.45.32.100	10.45.32.100
102	10.45.32.101/32	10.45.32.101 – 10.45.32.101	10.45.32.101
103	10.45.32.102/32	10.45.32.102 – 10.45.32.102	10.45.32.102
104	10.45.32.103/32	10.45.32.103 – 10.45.32.103	10.45.32.103
105	10.45.32.104/32	10.45.32.104 – 10.45.32.104	10.45.32.104
106	10.45.32.105/32	10.45.32.105 – 10.45.32.105	10.45.32.105
107	10.45.32.106/32	10.45.32.106 – 10.45.32.106	10.45.32.106
108	10.45.32.107/32	10.45.32.107 – 10.45.32.107	10.45.32.107
109	10.45.32.108/32	10.45.32.108 – 10.45.32.108	10.45.32.108
110	10.45.32.109/32	10.45.32.109 – 10.45.32.109	10.45.32.109
111	10.45.32.110/32	10.45.32.110 – 10.45.32.110	10.45.32.110
112	10.45.32.111/32	10.45.32.111 – 10.45.32.111	10.45.32.111
113	10.45.32.112/32	10.45.32.112 – 10.45.32.112	10.45.32.112
114	10.45.32.113/32	10.45.32.113 – 10.45.32.113	10.45.32.113
115	10.45.32.114/32	10.45.32.114 – 10.45.32.114	10.45.32.114
116	10.45.32.115/32	10.45.32.115 – 10.45.32.115	10.45.32.115
117	10.45.32.116/32	10.45.32.116 – 10.45.32.116	10.45.32.116
118	10.45.32.117/32	10.45.32.117 – 10.45.32.117	10.45.32.117
119	10.45.32.118/32	10.45.32.118 – 10.45.32.118	10.45.32.118
120	10.45.32.119/32	10.45.32.119 – 10.45.32.119	10.45.32.119
121	10.45.32.120/32	10.45.32.120 – 10.45.32.120	10.45.32.120
122	10.45.32.121/32	10.45.32.121 – 10.45.32.121	10.45.32.121
123	10.45.32.122/32	10.45.32.122 – 10.45.32.122	10.45.32.122
124	10.45.32.123/32	10.45.32.123 – 10.45.32.123	10.45.32.123
125	10.45.32.124/32	10.45.32.124 – 10.45.32.124	10.45.32.124
126	10.45.32.125/32	10.45.32.125 – 10.45.32.125	10.45.32.125
127	10.45.32.126/32	10.45.32.126 – 10.45.32.126	10.45.32.126
128	10.45.32.127/32	10.45.32.127 – 10.45.32.127	10.45.32.127

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 →