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)10.3.48.0/25

network10.3.48.0/25

broadcast10.3.48.127

first host10.3.48.1

last host10.3.48.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.3.48.0/25

address00001010.00000011.00110000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000011.00110000.00000000

broadcast00001010.00000011.00110000.01111111

green = network part, grey = host part

hex0x0a033000

decimal167981056

reverse dns0.48.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:3000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.48.0/32	10.3.48.0 – 10.3.48.0	10.3.48.0
2	10.3.48.1/32	10.3.48.1 – 10.3.48.1	10.3.48.1
3	10.3.48.2/32	10.3.48.2 – 10.3.48.2	10.3.48.2
4	10.3.48.3/32	10.3.48.3 – 10.3.48.3	10.3.48.3
5	10.3.48.4/32	10.3.48.4 – 10.3.48.4	10.3.48.4
6	10.3.48.5/32	10.3.48.5 – 10.3.48.5	10.3.48.5
7	10.3.48.6/32	10.3.48.6 – 10.3.48.6	10.3.48.6
8	10.3.48.7/32	10.3.48.7 – 10.3.48.7	10.3.48.7
9	10.3.48.8/32	10.3.48.8 – 10.3.48.8	10.3.48.8
10	10.3.48.9/32	10.3.48.9 – 10.3.48.9	10.3.48.9
11	10.3.48.10/32	10.3.48.10 – 10.3.48.10	10.3.48.10
12	10.3.48.11/32	10.3.48.11 – 10.3.48.11	10.3.48.11
13	10.3.48.12/32	10.3.48.12 – 10.3.48.12	10.3.48.12
14	10.3.48.13/32	10.3.48.13 – 10.3.48.13	10.3.48.13
15	10.3.48.14/32	10.3.48.14 – 10.3.48.14	10.3.48.14
16	10.3.48.15/32	10.3.48.15 – 10.3.48.15	10.3.48.15
17	10.3.48.16/32	10.3.48.16 – 10.3.48.16	10.3.48.16
18	10.3.48.17/32	10.3.48.17 – 10.3.48.17	10.3.48.17
19	10.3.48.18/32	10.3.48.18 – 10.3.48.18	10.3.48.18
20	10.3.48.19/32	10.3.48.19 – 10.3.48.19	10.3.48.19
21	10.3.48.20/32	10.3.48.20 – 10.3.48.20	10.3.48.20
22	10.3.48.21/32	10.3.48.21 – 10.3.48.21	10.3.48.21
23	10.3.48.22/32	10.3.48.22 – 10.3.48.22	10.3.48.22
24	10.3.48.23/32	10.3.48.23 – 10.3.48.23	10.3.48.23
25	10.3.48.24/32	10.3.48.24 – 10.3.48.24	10.3.48.24
26	10.3.48.25/32	10.3.48.25 – 10.3.48.25	10.3.48.25
27	10.3.48.26/32	10.3.48.26 – 10.3.48.26	10.3.48.26
28	10.3.48.27/32	10.3.48.27 – 10.3.48.27	10.3.48.27
29	10.3.48.28/32	10.3.48.28 – 10.3.48.28	10.3.48.28
30	10.3.48.29/32	10.3.48.29 – 10.3.48.29	10.3.48.29
31	10.3.48.30/32	10.3.48.30 – 10.3.48.30	10.3.48.30
32	10.3.48.31/32	10.3.48.31 – 10.3.48.31	10.3.48.31
33	10.3.48.32/32	10.3.48.32 – 10.3.48.32	10.3.48.32
34	10.3.48.33/32	10.3.48.33 – 10.3.48.33	10.3.48.33
35	10.3.48.34/32	10.3.48.34 – 10.3.48.34	10.3.48.34
36	10.3.48.35/32	10.3.48.35 – 10.3.48.35	10.3.48.35
37	10.3.48.36/32	10.3.48.36 – 10.3.48.36	10.3.48.36
38	10.3.48.37/32	10.3.48.37 – 10.3.48.37	10.3.48.37
39	10.3.48.38/32	10.3.48.38 – 10.3.48.38	10.3.48.38
40	10.3.48.39/32	10.3.48.39 – 10.3.48.39	10.3.48.39
41	10.3.48.40/32	10.3.48.40 – 10.3.48.40	10.3.48.40
42	10.3.48.41/32	10.3.48.41 – 10.3.48.41	10.3.48.41
43	10.3.48.42/32	10.3.48.42 – 10.3.48.42	10.3.48.42
44	10.3.48.43/32	10.3.48.43 – 10.3.48.43	10.3.48.43
45	10.3.48.44/32	10.3.48.44 – 10.3.48.44	10.3.48.44
46	10.3.48.45/32	10.3.48.45 – 10.3.48.45	10.3.48.45
47	10.3.48.46/32	10.3.48.46 – 10.3.48.46	10.3.48.46
48	10.3.48.47/32	10.3.48.47 – 10.3.48.47	10.3.48.47
49	10.3.48.48/32	10.3.48.48 – 10.3.48.48	10.3.48.48
50	10.3.48.49/32	10.3.48.49 – 10.3.48.49	10.3.48.49
51	10.3.48.50/32	10.3.48.50 – 10.3.48.50	10.3.48.50
52	10.3.48.51/32	10.3.48.51 – 10.3.48.51	10.3.48.51
53	10.3.48.52/32	10.3.48.52 – 10.3.48.52	10.3.48.52
54	10.3.48.53/32	10.3.48.53 – 10.3.48.53	10.3.48.53
55	10.3.48.54/32	10.3.48.54 – 10.3.48.54	10.3.48.54
56	10.3.48.55/32	10.3.48.55 – 10.3.48.55	10.3.48.55
57	10.3.48.56/32	10.3.48.56 – 10.3.48.56	10.3.48.56
58	10.3.48.57/32	10.3.48.57 – 10.3.48.57	10.3.48.57
59	10.3.48.58/32	10.3.48.58 – 10.3.48.58	10.3.48.58
60	10.3.48.59/32	10.3.48.59 – 10.3.48.59	10.3.48.59
61	10.3.48.60/32	10.3.48.60 – 10.3.48.60	10.3.48.60
62	10.3.48.61/32	10.3.48.61 – 10.3.48.61	10.3.48.61
63	10.3.48.62/32	10.3.48.62 – 10.3.48.62	10.3.48.62
64	10.3.48.63/32	10.3.48.63 – 10.3.48.63	10.3.48.63
65	10.3.48.64/32	10.3.48.64 – 10.3.48.64	10.3.48.64
66	10.3.48.65/32	10.3.48.65 – 10.3.48.65	10.3.48.65
67	10.3.48.66/32	10.3.48.66 – 10.3.48.66	10.3.48.66
68	10.3.48.67/32	10.3.48.67 – 10.3.48.67	10.3.48.67
69	10.3.48.68/32	10.3.48.68 – 10.3.48.68	10.3.48.68
70	10.3.48.69/32	10.3.48.69 – 10.3.48.69	10.3.48.69
71	10.3.48.70/32	10.3.48.70 – 10.3.48.70	10.3.48.70
72	10.3.48.71/32	10.3.48.71 – 10.3.48.71	10.3.48.71
73	10.3.48.72/32	10.3.48.72 – 10.3.48.72	10.3.48.72
74	10.3.48.73/32	10.3.48.73 – 10.3.48.73	10.3.48.73
75	10.3.48.74/32	10.3.48.74 – 10.3.48.74	10.3.48.74
76	10.3.48.75/32	10.3.48.75 – 10.3.48.75	10.3.48.75
77	10.3.48.76/32	10.3.48.76 – 10.3.48.76	10.3.48.76
78	10.3.48.77/32	10.3.48.77 – 10.3.48.77	10.3.48.77
79	10.3.48.78/32	10.3.48.78 – 10.3.48.78	10.3.48.78
80	10.3.48.79/32	10.3.48.79 – 10.3.48.79	10.3.48.79
81	10.3.48.80/32	10.3.48.80 – 10.3.48.80	10.3.48.80
82	10.3.48.81/32	10.3.48.81 – 10.3.48.81	10.3.48.81
83	10.3.48.82/32	10.3.48.82 – 10.3.48.82	10.3.48.82
84	10.3.48.83/32	10.3.48.83 – 10.3.48.83	10.3.48.83
85	10.3.48.84/32	10.3.48.84 – 10.3.48.84	10.3.48.84
86	10.3.48.85/32	10.3.48.85 – 10.3.48.85	10.3.48.85
87	10.3.48.86/32	10.3.48.86 – 10.3.48.86	10.3.48.86
88	10.3.48.87/32	10.3.48.87 – 10.3.48.87	10.3.48.87
89	10.3.48.88/32	10.3.48.88 – 10.3.48.88	10.3.48.88
90	10.3.48.89/32	10.3.48.89 – 10.3.48.89	10.3.48.89
91	10.3.48.90/32	10.3.48.90 – 10.3.48.90	10.3.48.90
92	10.3.48.91/32	10.3.48.91 – 10.3.48.91	10.3.48.91
93	10.3.48.92/32	10.3.48.92 – 10.3.48.92	10.3.48.92
94	10.3.48.93/32	10.3.48.93 – 10.3.48.93	10.3.48.93
95	10.3.48.94/32	10.3.48.94 – 10.3.48.94	10.3.48.94
96	10.3.48.95/32	10.3.48.95 – 10.3.48.95	10.3.48.95
97	10.3.48.96/32	10.3.48.96 – 10.3.48.96	10.3.48.96
98	10.3.48.97/32	10.3.48.97 – 10.3.48.97	10.3.48.97
99	10.3.48.98/32	10.3.48.98 – 10.3.48.98	10.3.48.98
100	10.3.48.99/32	10.3.48.99 – 10.3.48.99	10.3.48.99
101	10.3.48.100/32	10.3.48.100 – 10.3.48.100	10.3.48.100
102	10.3.48.101/32	10.3.48.101 – 10.3.48.101	10.3.48.101
103	10.3.48.102/32	10.3.48.102 – 10.3.48.102	10.3.48.102
104	10.3.48.103/32	10.3.48.103 – 10.3.48.103	10.3.48.103
105	10.3.48.104/32	10.3.48.104 – 10.3.48.104	10.3.48.104
106	10.3.48.105/32	10.3.48.105 – 10.3.48.105	10.3.48.105
107	10.3.48.106/32	10.3.48.106 – 10.3.48.106	10.3.48.106
108	10.3.48.107/32	10.3.48.107 – 10.3.48.107	10.3.48.107
109	10.3.48.108/32	10.3.48.108 – 10.3.48.108	10.3.48.108
110	10.3.48.109/32	10.3.48.109 – 10.3.48.109	10.3.48.109
111	10.3.48.110/32	10.3.48.110 – 10.3.48.110	10.3.48.110
112	10.3.48.111/32	10.3.48.111 – 10.3.48.111	10.3.48.111
113	10.3.48.112/32	10.3.48.112 – 10.3.48.112	10.3.48.112
114	10.3.48.113/32	10.3.48.113 – 10.3.48.113	10.3.48.113
115	10.3.48.114/32	10.3.48.114 – 10.3.48.114	10.3.48.114
116	10.3.48.115/32	10.3.48.115 – 10.3.48.115	10.3.48.115
117	10.3.48.116/32	10.3.48.116 – 10.3.48.116	10.3.48.116
118	10.3.48.117/32	10.3.48.117 – 10.3.48.117	10.3.48.117
119	10.3.48.118/32	10.3.48.118 – 10.3.48.118	10.3.48.118
120	10.3.48.119/32	10.3.48.119 – 10.3.48.119	10.3.48.119
121	10.3.48.120/32	10.3.48.120 – 10.3.48.120	10.3.48.120
122	10.3.48.121/32	10.3.48.121 – 10.3.48.121	10.3.48.121
123	10.3.48.122/32	10.3.48.122 – 10.3.48.122	10.3.48.122
124	10.3.48.123/32	10.3.48.123 – 10.3.48.123	10.3.48.123
125	10.3.48.124/32	10.3.48.124 – 10.3.48.124	10.3.48.124
126	10.3.48.125/32	10.3.48.125 – 10.3.48.125	10.3.48.125
127	10.3.48.126/32	10.3.48.126 – 10.3.48.126	10.3.48.126
128	10.3.48.127/32	10.3.48.127 – 10.3.48.127	10.3.48.127

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 →