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)10.63.4.0/25

network10.63.4.0/25

broadcast10.63.4.127

first host10.63.4.1

last host10.63.4.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.63.4.0/25

address00001010.00111111.00000100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00111111.00000100.00000000

broadcast00001010.00111111.00000100.01111111

green = network part, grey = host part

hex0x0a3f0400

decimal171901952

reverse dns0.4.63.10.in-addr.arpa

ipv4-mapped::ffff:a3f:400

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.63.4.0/32	10.63.4.0 – 10.63.4.0	10.63.4.0
2	10.63.4.1/32	10.63.4.1 – 10.63.4.1	10.63.4.1
3	10.63.4.2/32	10.63.4.2 – 10.63.4.2	10.63.4.2
4	10.63.4.3/32	10.63.4.3 – 10.63.4.3	10.63.4.3
5	10.63.4.4/32	10.63.4.4 – 10.63.4.4	10.63.4.4
6	10.63.4.5/32	10.63.4.5 – 10.63.4.5	10.63.4.5
7	10.63.4.6/32	10.63.4.6 – 10.63.4.6	10.63.4.6
8	10.63.4.7/32	10.63.4.7 – 10.63.4.7	10.63.4.7
9	10.63.4.8/32	10.63.4.8 – 10.63.4.8	10.63.4.8
10	10.63.4.9/32	10.63.4.9 – 10.63.4.9	10.63.4.9
11	10.63.4.10/32	10.63.4.10 – 10.63.4.10	10.63.4.10
12	10.63.4.11/32	10.63.4.11 – 10.63.4.11	10.63.4.11
13	10.63.4.12/32	10.63.4.12 – 10.63.4.12	10.63.4.12
14	10.63.4.13/32	10.63.4.13 – 10.63.4.13	10.63.4.13
15	10.63.4.14/32	10.63.4.14 – 10.63.4.14	10.63.4.14
16	10.63.4.15/32	10.63.4.15 – 10.63.4.15	10.63.4.15
17	10.63.4.16/32	10.63.4.16 – 10.63.4.16	10.63.4.16
18	10.63.4.17/32	10.63.4.17 – 10.63.4.17	10.63.4.17
19	10.63.4.18/32	10.63.4.18 – 10.63.4.18	10.63.4.18
20	10.63.4.19/32	10.63.4.19 – 10.63.4.19	10.63.4.19
21	10.63.4.20/32	10.63.4.20 – 10.63.4.20	10.63.4.20
22	10.63.4.21/32	10.63.4.21 – 10.63.4.21	10.63.4.21
23	10.63.4.22/32	10.63.4.22 – 10.63.4.22	10.63.4.22
24	10.63.4.23/32	10.63.4.23 – 10.63.4.23	10.63.4.23
25	10.63.4.24/32	10.63.4.24 – 10.63.4.24	10.63.4.24
26	10.63.4.25/32	10.63.4.25 – 10.63.4.25	10.63.4.25
27	10.63.4.26/32	10.63.4.26 – 10.63.4.26	10.63.4.26
28	10.63.4.27/32	10.63.4.27 – 10.63.4.27	10.63.4.27
29	10.63.4.28/32	10.63.4.28 – 10.63.4.28	10.63.4.28
30	10.63.4.29/32	10.63.4.29 – 10.63.4.29	10.63.4.29
31	10.63.4.30/32	10.63.4.30 – 10.63.4.30	10.63.4.30
32	10.63.4.31/32	10.63.4.31 – 10.63.4.31	10.63.4.31
33	10.63.4.32/32	10.63.4.32 – 10.63.4.32	10.63.4.32
34	10.63.4.33/32	10.63.4.33 – 10.63.4.33	10.63.4.33
35	10.63.4.34/32	10.63.4.34 – 10.63.4.34	10.63.4.34
36	10.63.4.35/32	10.63.4.35 – 10.63.4.35	10.63.4.35
37	10.63.4.36/32	10.63.4.36 – 10.63.4.36	10.63.4.36
38	10.63.4.37/32	10.63.4.37 – 10.63.4.37	10.63.4.37
39	10.63.4.38/32	10.63.4.38 – 10.63.4.38	10.63.4.38
40	10.63.4.39/32	10.63.4.39 – 10.63.4.39	10.63.4.39
41	10.63.4.40/32	10.63.4.40 – 10.63.4.40	10.63.4.40
42	10.63.4.41/32	10.63.4.41 – 10.63.4.41	10.63.4.41
43	10.63.4.42/32	10.63.4.42 – 10.63.4.42	10.63.4.42
44	10.63.4.43/32	10.63.4.43 – 10.63.4.43	10.63.4.43
45	10.63.4.44/32	10.63.4.44 – 10.63.4.44	10.63.4.44
46	10.63.4.45/32	10.63.4.45 – 10.63.4.45	10.63.4.45
47	10.63.4.46/32	10.63.4.46 – 10.63.4.46	10.63.4.46
48	10.63.4.47/32	10.63.4.47 – 10.63.4.47	10.63.4.47
49	10.63.4.48/32	10.63.4.48 – 10.63.4.48	10.63.4.48
50	10.63.4.49/32	10.63.4.49 – 10.63.4.49	10.63.4.49
51	10.63.4.50/32	10.63.4.50 – 10.63.4.50	10.63.4.50
52	10.63.4.51/32	10.63.4.51 – 10.63.4.51	10.63.4.51
53	10.63.4.52/32	10.63.4.52 – 10.63.4.52	10.63.4.52
54	10.63.4.53/32	10.63.4.53 – 10.63.4.53	10.63.4.53
55	10.63.4.54/32	10.63.4.54 – 10.63.4.54	10.63.4.54
56	10.63.4.55/32	10.63.4.55 – 10.63.4.55	10.63.4.55
57	10.63.4.56/32	10.63.4.56 – 10.63.4.56	10.63.4.56
58	10.63.4.57/32	10.63.4.57 – 10.63.4.57	10.63.4.57
59	10.63.4.58/32	10.63.4.58 – 10.63.4.58	10.63.4.58
60	10.63.4.59/32	10.63.4.59 – 10.63.4.59	10.63.4.59
61	10.63.4.60/32	10.63.4.60 – 10.63.4.60	10.63.4.60
62	10.63.4.61/32	10.63.4.61 – 10.63.4.61	10.63.4.61
63	10.63.4.62/32	10.63.4.62 – 10.63.4.62	10.63.4.62
64	10.63.4.63/32	10.63.4.63 – 10.63.4.63	10.63.4.63
65	10.63.4.64/32	10.63.4.64 – 10.63.4.64	10.63.4.64
66	10.63.4.65/32	10.63.4.65 – 10.63.4.65	10.63.4.65
67	10.63.4.66/32	10.63.4.66 – 10.63.4.66	10.63.4.66
68	10.63.4.67/32	10.63.4.67 – 10.63.4.67	10.63.4.67
69	10.63.4.68/32	10.63.4.68 – 10.63.4.68	10.63.4.68
70	10.63.4.69/32	10.63.4.69 – 10.63.4.69	10.63.4.69
71	10.63.4.70/32	10.63.4.70 – 10.63.4.70	10.63.4.70
72	10.63.4.71/32	10.63.4.71 – 10.63.4.71	10.63.4.71
73	10.63.4.72/32	10.63.4.72 – 10.63.4.72	10.63.4.72
74	10.63.4.73/32	10.63.4.73 – 10.63.4.73	10.63.4.73
75	10.63.4.74/32	10.63.4.74 – 10.63.4.74	10.63.4.74
76	10.63.4.75/32	10.63.4.75 – 10.63.4.75	10.63.4.75
77	10.63.4.76/32	10.63.4.76 – 10.63.4.76	10.63.4.76
78	10.63.4.77/32	10.63.4.77 – 10.63.4.77	10.63.4.77
79	10.63.4.78/32	10.63.4.78 – 10.63.4.78	10.63.4.78
80	10.63.4.79/32	10.63.4.79 – 10.63.4.79	10.63.4.79
81	10.63.4.80/32	10.63.4.80 – 10.63.4.80	10.63.4.80
82	10.63.4.81/32	10.63.4.81 – 10.63.4.81	10.63.4.81
83	10.63.4.82/32	10.63.4.82 – 10.63.4.82	10.63.4.82
84	10.63.4.83/32	10.63.4.83 – 10.63.4.83	10.63.4.83
85	10.63.4.84/32	10.63.4.84 – 10.63.4.84	10.63.4.84
86	10.63.4.85/32	10.63.4.85 – 10.63.4.85	10.63.4.85
87	10.63.4.86/32	10.63.4.86 – 10.63.4.86	10.63.4.86
88	10.63.4.87/32	10.63.4.87 – 10.63.4.87	10.63.4.87
89	10.63.4.88/32	10.63.4.88 – 10.63.4.88	10.63.4.88
90	10.63.4.89/32	10.63.4.89 – 10.63.4.89	10.63.4.89
91	10.63.4.90/32	10.63.4.90 – 10.63.4.90	10.63.4.90
92	10.63.4.91/32	10.63.4.91 – 10.63.4.91	10.63.4.91
93	10.63.4.92/32	10.63.4.92 – 10.63.4.92	10.63.4.92
94	10.63.4.93/32	10.63.4.93 – 10.63.4.93	10.63.4.93
95	10.63.4.94/32	10.63.4.94 – 10.63.4.94	10.63.4.94
96	10.63.4.95/32	10.63.4.95 – 10.63.4.95	10.63.4.95
97	10.63.4.96/32	10.63.4.96 – 10.63.4.96	10.63.4.96
98	10.63.4.97/32	10.63.4.97 – 10.63.4.97	10.63.4.97
99	10.63.4.98/32	10.63.4.98 – 10.63.4.98	10.63.4.98
100	10.63.4.99/32	10.63.4.99 – 10.63.4.99	10.63.4.99
101	10.63.4.100/32	10.63.4.100 – 10.63.4.100	10.63.4.100
102	10.63.4.101/32	10.63.4.101 – 10.63.4.101	10.63.4.101
103	10.63.4.102/32	10.63.4.102 – 10.63.4.102	10.63.4.102
104	10.63.4.103/32	10.63.4.103 – 10.63.4.103	10.63.4.103
105	10.63.4.104/32	10.63.4.104 – 10.63.4.104	10.63.4.104
106	10.63.4.105/32	10.63.4.105 – 10.63.4.105	10.63.4.105
107	10.63.4.106/32	10.63.4.106 – 10.63.4.106	10.63.4.106
108	10.63.4.107/32	10.63.4.107 – 10.63.4.107	10.63.4.107
109	10.63.4.108/32	10.63.4.108 – 10.63.4.108	10.63.4.108
110	10.63.4.109/32	10.63.4.109 – 10.63.4.109	10.63.4.109
111	10.63.4.110/32	10.63.4.110 – 10.63.4.110	10.63.4.110
112	10.63.4.111/32	10.63.4.111 – 10.63.4.111	10.63.4.111
113	10.63.4.112/32	10.63.4.112 – 10.63.4.112	10.63.4.112
114	10.63.4.113/32	10.63.4.113 – 10.63.4.113	10.63.4.113
115	10.63.4.114/32	10.63.4.114 – 10.63.4.114	10.63.4.114
116	10.63.4.115/32	10.63.4.115 – 10.63.4.115	10.63.4.115
117	10.63.4.116/32	10.63.4.116 – 10.63.4.116	10.63.4.116
118	10.63.4.117/32	10.63.4.117 – 10.63.4.117	10.63.4.117
119	10.63.4.118/32	10.63.4.118 – 10.63.4.118	10.63.4.118
120	10.63.4.119/32	10.63.4.119 – 10.63.4.119	10.63.4.119
121	10.63.4.120/32	10.63.4.120 – 10.63.4.120	10.63.4.120
122	10.63.4.121/32	10.63.4.121 – 10.63.4.121	10.63.4.121
123	10.63.4.122/32	10.63.4.122 – 10.63.4.122	10.63.4.122
124	10.63.4.123/32	10.63.4.123 – 10.63.4.123	10.63.4.123
125	10.63.4.124/32	10.63.4.124 – 10.63.4.124	10.63.4.124
126	10.63.4.125/32	10.63.4.125 – 10.63.4.125	10.63.4.125
127	10.63.4.126/32	10.63.4.126 – 10.63.4.126	10.63.4.126
128	10.63.4.127/32	10.63.4.127 – 10.63.4.127	10.63.4.127

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 →