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)10.4.63.0/25

network10.4.63.0/25

broadcast10.4.63.127

first host10.4.63.1

last host10.4.63.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.4.63.0/25

address00001010.00000100.00111111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000100.00111111.00000000

broadcast00001010.00000100.00111111.01111111

green = network part, grey = host part

hex0x0a043f00

decimal168050432

reverse dns0.63.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:3f00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.63.0/32	10.4.63.0 – 10.4.63.0	10.4.63.0
2	10.4.63.1/32	10.4.63.1 – 10.4.63.1	10.4.63.1
3	10.4.63.2/32	10.4.63.2 – 10.4.63.2	10.4.63.2
4	10.4.63.3/32	10.4.63.3 – 10.4.63.3	10.4.63.3
5	10.4.63.4/32	10.4.63.4 – 10.4.63.4	10.4.63.4
6	10.4.63.5/32	10.4.63.5 – 10.4.63.5	10.4.63.5
7	10.4.63.6/32	10.4.63.6 – 10.4.63.6	10.4.63.6
8	10.4.63.7/32	10.4.63.7 – 10.4.63.7	10.4.63.7
9	10.4.63.8/32	10.4.63.8 – 10.4.63.8	10.4.63.8
10	10.4.63.9/32	10.4.63.9 – 10.4.63.9	10.4.63.9
11	10.4.63.10/32	10.4.63.10 – 10.4.63.10	10.4.63.10
12	10.4.63.11/32	10.4.63.11 – 10.4.63.11	10.4.63.11
13	10.4.63.12/32	10.4.63.12 – 10.4.63.12	10.4.63.12
14	10.4.63.13/32	10.4.63.13 – 10.4.63.13	10.4.63.13
15	10.4.63.14/32	10.4.63.14 – 10.4.63.14	10.4.63.14
16	10.4.63.15/32	10.4.63.15 – 10.4.63.15	10.4.63.15
17	10.4.63.16/32	10.4.63.16 – 10.4.63.16	10.4.63.16
18	10.4.63.17/32	10.4.63.17 – 10.4.63.17	10.4.63.17
19	10.4.63.18/32	10.4.63.18 – 10.4.63.18	10.4.63.18
20	10.4.63.19/32	10.4.63.19 – 10.4.63.19	10.4.63.19
21	10.4.63.20/32	10.4.63.20 – 10.4.63.20	10.4.63.20
22	10.4.63.21/32	10.4.63.21 – 10.4.63.21	10.4.63.21
23	10.4.63.22/32	10.4.63.22 – 10.4.63.22	10.4.63.22
24	10.4.63.23/32	10.4.63.23 – 10.4.63.23	10.4.63.23
25	10.4.63.24/32	10.4.63.24 – 10.4.63.24	10.4.63.24
26	10.4.63.25/32	10.4.63.25 – 10.4.63.25	10.4.63.25
27	10.4.63.26/32	10.4.63.26 – 10.4.63.26	10.4.63.26
28	10.4.63.27/32	10.4.63.27 – 10.4.63.27	10.4.63.27
29	10.4.63.28/32	10.4.63.28 – 10.4.63.28	10.4.63.28
30	10.4.63.29/32	10.4.63.29 – 10.4.63.29	10.4.63.29
31	10.4.63.30/32	10.4.63.30 – 10.4.63.30	10.4.63.30
32	10.4.63.31/32	10.4.63.31 – 10.4.63.31	10.4.63.31
33	10.4.63.32/32	10.4.63.32 – 10.4.63.32	10.4.63.32
34	10.4.63.33/32	10.4.63.33 – 10.4.63.33	10.4.63.33
35	10.4.63.34/32	10.4.63.34 – 10.4.63.34	10.4.63.34
36	10.4.63.35/32	10.4.63.35 – 10.4.63.35	10.4.63.35
37	10.4.63.36/32	10.4.63.36 – 10.4.63.36	10.4.63.36
38	10.4.63.37/32	10.4.63.37 – 10.4.63.37	10.4.63.37
39	10.4.63.38/32	10.4.63.38 – 10.4.63.38	10.4.63.38
40	10.4.63.39/32	10.4.63.39 – 10.4.63.39	10.4.63.39
41	10.4.63.40/32	10.4.63.40 – 10.4.63.40	10.4.63.40
42	10.4.63.41/32	10.4.63.41 – 10.4.63.41	10.4.63.41
43	10.4.63.42/32	10.4.63.42 – 10.4.63.42	10.4.63.42
44	10.4.63.43/32	10.4.63.43 – 10.4.63.43	10.4.63.43
45	10.4.63.44/32	10.4.63.44 – 10.4.63.44	10.4.63.44
46	10.4.63.45/32	10.4.63.45 – 10.4.63.45	10.4.63.45
47	10.4.63.46/32	10.4.63.46 – 10.4.63.46	10.4.63.46
48	10.4.63.47/32	10.4.63.47 – 10.4.63.47	10.4.63.47
49	10.4.63.48/32	10.4.63.48 – 10.4.63.48	10.4.63.48
50	10.4.63.49/32	10.4.63.49 – 10.4.63.49	10.4.63.49
51	10.4.63.50/32	10.4.63.50 – 10.4.63.50	10.4.63.50
52	10.4.63.51/32	10.4.63.51 – 10.4.63.51	10.4.63.51
53	10.4.63.52/32	10.4.63.52 – 10.4.63.52	10.4.63.52
54	10.4.63.53/32	10.4.63.53 – 10.4.63.53	10.4.63.53
55	10.4.63.54/32	10.4.63.54 – 10.4.63.54	10.4.63.54
56	10.4.63.55/32	10.4.63.55 – 10.4.63.55	10.4.63.55
57	10.4.63.56/32	10.4.63.56 – 10.4.63.56	10.4.63.56
58	10.4.63.57/32	10.4.63.57 – 10.4.63.57	10.4.63.57
59	10.4.63.58/32	10.4.63.58 – 10.4.63.58	10.4.63.58
60	10.4.63.59/32	10.4.63.59 – 10.4.63.59	10.4.63.59
61	10.4.63.60/32	10.4.63.60 – 10.4.63.60	10.4.63.60
62	10.4.63.61/32	10.4.63.61 – 10.4.63.61	10.4.63.61
63	10.4.63.62/32	10.4.63.62 – 10.4.63.62	10.4.63.62
64	10.4.63.63/32	10.4.63.63 – 10.4.63.63	10.4.63.63
65	10.4.63.64/32	10.4.63.64 – 10.4.63.64	10.4.63.64
66	10.4.63.65/32	10.4.63.65 – 10.4.63.65	10.4.63.65
67	10.4.63.66/32	10.4.63.66 – 10.4.63.66	10.4.63.66
68	10.4.63.67/32	10.4.63.67 – 10.4.63.67	10.4.63.67
69	10.4.63.68/32	10.4.63.68 – 10.4.63.68	10.4.63.68
70	10.4.63.69/32	10.4.63.69 – 10.4.63.69	10.4.63.69
71	10.4.63.70/32	10.4.63.70 – 10.4.63.70	10.4.63.70
72	10.4.63.71/32	10.4.63.71 – 10.4.63.71	10.4.63.71
73	10.4.63.72/32	10.4.63.72 – 10.4.63.72	10.4.63.72
74	10.4.63.73/32	10.4.63.73 – 10.4.63.73	10.4.63.73
75	10.4.63.74/32	10.4.63.74 – 10.4.63.74	10.4.63.74
76	10.4.63.75/32	10.4.63.75 – 10.4.63.75	10.4.63.75
77	10.4.63.76/32	10.4.63.76 – 10.4.63.76	10.4.63.76
78	10.4.63.77/32	10.4.63.77 – 10.4.63.77	10.4.63.77
79	10.4.63.78/32	10.4.63.78 – 10.4.63.78	10.4.63.78
80	10.4.63.79/32	10.4.63.79 – 10.4.63.79	10.4.63.79
81	10.4.63.80/32	10.4.63.80 – 10.4.63.80	10.4.63.80
82	10.4.63.81/32	10.4.63.81 – 10.4.63.81	10.4.63.81
83	10.4.63.82/32	10.4.63.82 – 10.4.63.82	10.4.63.82
84	10.4.63.83/32	10.4.63.83 – 10.4.63.83	10.4.63.83
85	10.4.63.84/32	10.4.63.84 – 10.4.63.84	10.4.63.84
86	10.4.63.85/32	10.4.63.85 – 10.4.63.85	10.4.63.85
87	10.4.63.86/32	10.4.63.86 – 10.4.63.86	10.4.63.86
88	10.4.63.87/32	10.4.63.87 – 10.4.63.87	10.4.63.87
89	10.4.63.88/32	10.4.63.88 – 10.4.63.88	10.4.63.88
90	10.4.63.89/32	10.4.63.89 – 10.4.63.89	10.4.63.89
91	10.4.63.90/32	10.4.63.90 – 10.4.63.90	10.4.63.90
92	10.4.63.91/32	10.4.63.91 – 10.4.63.91	10.4.63.91
93	10.4.63.92/32	10.4.63.92 – 10.4.63.92	10.4.63.92
94	10.4.63.93/32	10.4.63.93 – 10.4.63.93	10.4.63.93
95	10.4.63.94/32	10.4.63.94 – 10.4.63.94	10.4.63.94
96	10.4.63.95/32	10.4.63.95 – 10.4.63.95	10.4.63.95
97	10.4.63.96/32	10.4.63.96 – 10.4.63.96	10.4.63.96
98	10.4.63.97/32	10.4.63.97 – 10.4.63.97	10.4.63.97
99	10.4.63.98/32	10.4.63.98 – 10.4.63.98	10.4.63.98
100	10.4.63.99/32	10.4.63.99 – 10.4.63.99	10.4.63.99
101	10.4.63.100/32	10.4.63.100 – 10.4.63.100	10.4.63.100
102	10.4.63.101/32	10.4.63.101 – 10.4.63.101	10.4.63.101
103	10.4.63.102/32	10.4.63.102 – 10.4.63.102	10.4.63.102
104	10.4.63.103/32	10.4.63.103 – 10.4.63.103	10.4.63.103
105	10.4.63.104/32	10.4.63.104 – 10.4.63.104	10.4.63.104
106	10.4.63.105/32	10.4.63.105 – 10.4.63.105	10.4.63.105
107	10.4.63.106/32	10.4.63.106 – 10.4.63.106	10.4.63.106
108	10.4.63.107/32	10.4.63.107 – 10.4.63.107	10.4.63.107
109	10.4.63.108/32	10.4.63.108 – 10.4.63.108	10.4.63.108
110	10.4.63.109/32	10.4.63.109 – 10.4.63.109	10.4.63.109
111	10.4.63.110/32	10.4.63.110 – 10.4.63.110	10.4.63.110
112	10.4.63.111/32	10.4.63.111 – 10.4.63.111	10.4.63.111
113	10.4.63.112/32	10.4.63.112 – 10.4.63.112	10.4.63.112
114	10.4.63.113/32	10.4.63.113 – 10.4.63.113	10.4.63.113
115	10.4.63.114/32	10.4.63.114 – 10.4.63.114	10.4.63.114
116	10.4.63.115/32	10.4.63.115 – 10.4.63.115	10.4.63.115
117	10.4.63.116/32	10.4.63.116 – 10.4.63.116	10.4.63.116
118	10.4.63.117/32	10.4.63.117 – 10.4.63.117	10.4.63.117
119	10.4.63.118/32	10.4.63.118 – 10.4.63.118	10.4.63.118
120	10.4.63.119/32	10.4.63.119 – 10.4.63.119	10.4.63.119
121	10.4.63.120/32	10.4.63.120 – 10.4.63.120	10.4.63.120
122	10.4.63.121/32	10.4.63.121 – 10.4.63.121	10.4.63.121
123	10.4.63.122/32	10.4.63.122 – 10.4.63.122	10.4.63.122
124	10.4.63.123/32	10.4.63.123 – 10.4.63.123	10.4.63.123
125	10.4.63.124/32	10.4.63.124 – 10.4.63.124	10.4.63.124
126	10.4.63.125/32	10.4.63.125 – 10.4.63.125	10.4.63.125
127	10.4.63.126/32	10.4.63.126 – 10.4.63.126	10.4.63.126
128	10.4.63.127/32	10.4.63.127 – 10.4.63.127	10.4.63.127

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 →