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)10.4.43.0/25

network10.4.43.0/25

broadcast10.4.43.127

first host10.4.43.1

last host10.4.43.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.4.43.0/25

address00001010.00000100.00101011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000100.00101011.00000000

broadcast00001010.00000100.00101011.01111111

green = network part, grey = host part

hex0x0a042b00

decimal168045312

reverse dns0.43.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:2b00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.43.0/32	10.4.43.0 – 10.4.43.0	10.4.43.0
2	10.4.43.1/32	10.4.43.1 – 10.4.43.1	10.4.43.1
3	10.4.43.2/32	10.4.43.2 – 10.4.43.2	10.4.43.2
4	10.4.43.3/32	10.4.43.3 – 10.4.43.3	10.4.43.3
5	10.4.43.4/32	10.4.43.4 – 10.4.43.4	10.4.43.4
6	10.4.43.5/32	10.4.43.5 – 10.4.43.5	10.4.43.5
7	10.4.43.6/32	10.4.43.6 – 10.4.43.6	10.4.43.6
8	10.4.43.7/32	10.4.43.7 – 10.4.43.7	10.4.43.7
9	10.4.43.8/32	10.4.43.8 – 10.4.43.8	10.4.43.8
10	10.4.43.9/32	10.4.43.9 – 10.4.43.9	10.4.43.9
11	10.4.43.10/32	10.4.43.10 – 10.4.43.10	10.4.43.10
12	10.4.43.11/32	10.4.43.11 – 10.4.43.11	10.4.43.11
13	10.4.43.12/32	10.4.43.12 – 10.4.43.12	10.4.43.12
14	10.4.43.13/32	10.4.43.13 – 10.4.43.13	10.4.43.13
15	10.4.43.14/32	10.4.43.14 – 10.4.43.14	10.4.43.14
16	10.4.43.15/32	10.4.43.15 – 10.4.43.15	10.4.43.15
17	10.4.43.16/32	10.4.43.16 – 10.4.43.16	10.4.43.16
18	10.4.43.17/32	10.4.43.17 – 10.4.43.17	10.4.43.17
19	10.4.43.18/32	10.4.43.18 – 10.4.43.18	10.4.43.18
20	10.4.43.19/32	10.4.43.19 – 10.4.43.19	10.4.43.19
21	10.4.43.20/32	10.4.43.20 – 10.4.43.20	10.4.43.20
22	10.4.43.21/32	10.4.43.21 – 10.4.43.21	10.4.43.21
23	10.4.43.22/32	10.4.43.22 – 10.4.43.22	10.4.43.22
24	10.4.43.23/32	10.4.43.23 – 10.4.43.23	10.4.43.23
25	10.4.43.24/32	10.4.43.24 – 10.4.43.24	10.4.43.24
26	10.4.43.25/32	10.4.43.25 – 10.4.43.25	10.4.43.25
27	10.4.43.26/32	10.4.43.26 – 10.4.43.26	10.4.43.26
28	10.4.43.27/32	10.4.43.27 – 10.4.43.27	10.4.43.27
29	10.4.43.28/32	10.4.43.28 – 10.4.43.28	10.4.43.28
30	10.4.43.29/32	10.4.43.29 – 10.4.43.29	10.4.43.29
31	10.4.43.30/32	10.4.43.30 – 10.4.43.30	10.4.43.30
32	10.4.43.31/32	10.4.43.31 – 10.4.43.31	10.4.43.31
33	10.4.43.32/32	10.4.43.32 – 10.4.43.32	10.4.43.32
34	10.4.43.33/32	10.4.43.33 – 10.4.43.33	10.4.43.33
35	10.4.43.34/32	10.4.43.34 – 10.4.43.34	10.4.43.34
36	10.4.43.35/32	10.4.43.35 – 10.4.43.35	10.4.43.35
37	10.4.43.36/32	10.4.43.36 – 10.4.43.36	10.4.43.36
38	10.4.43.37/32	10.4.43.37 – 10.4.43.37	10.4.43.37
39	10.4.43.38/32	10.4.43.38 – 10.4.43.38	10.4.43.38
40	10.4.43.39/32	10.4.43.39 – 10.4.43.39	10.4.43.39
41	10.4.43.40/32	10.4.43.40 – 10.4.43.40	10.4.43.40
42	10.4.43.41/32	10.4.43.41 – 10.4.43.41	10.4.43.41
43	10.4.43.42/32	10.4.43.42 – 10.4.43.42	10.4.43.42
44	10.4.43.43/32	10.4.43.43 – 10.4.43.43	10.4.43.43
45	10.4.43.44/32	10.4.43.44 – 10.4.43.44	10.4.43.44
46	10.4.43.45/32	10.4.43.45 – 10.4.43.45	10.4.43.45
47	10.4.43.46/32	10.4.43.46 – 10.4.43.46	10.4.43.46
48	10.4.43.47/32	10.4.43.47 – 10.4.43.47	10.4.43.47
49	10.4.43.48/32	10.4.43.48 – 10.4.43.48	10.4.43.48
50	10.4.43.49/32	10.4.43.49 – 10.4.43.49	10.4.43.49
51	10.4.43.50/32	10.4.43.50 – 10.4.43.50	10.4.43.50
52	10.4.43.51/32	10.4.43.51 – 10.4.43.51	10.4.43.51
53	10.4.43.52/32	10.4.43.52 – 10.4.43.52	10.4.43.52
54	10.4.43.53/32	10.4.43.53 – 10.4.43.53	10.4.43.53
55	10.4.43.54/32	10.4.43.54 – 10.4.43.54	10.4.43.54
56	10.4.43.55/32	10.4.43.55 – 10.4.43.55	10.4.43.55
57	10.4.43.56/32	10.4.43.56 – 10.4.43.56	10.4.43.56
58	10.4.43.57/32	10.4.43.57 – 10.4.43.57	10.4.43.57
59	10.4.43.58/32	10.4.43.58 – 10.4.43.58	10.4.43.58
60	10.4.43.59/32	10.4.43.59 – 10.4.43.59	10.4.43.59
61	10.4.43.60/32	10.4.43.60 – 10.4.43.60	10.4.43.60
62	10.4.43.61/32	10.4.43.61 – 10.4.43.61	10.4.43.61
63	10.4.43.62/32	10.4.43.62 – 10.4.43.62	10.4.43.62
64	10.4.43.63/32	10.4.43.63 – 10.4.43.63	10.4.43.63
65	10.4.43.64/32	10.4.43.64 – 10.4.43.64	10.4.43.64
66	10.4.43.65/32	10.4.43.65 – 10.4.43.65	10.4.43.65
67	10.4.43.66/32	10.4.43.66 – 10.4.43.66	10.4.43.66
68	10.4.43.67/32	10.4.43.67 – 10.4.43.67	10.4.43.67
69	10.4.43.68/32	10.4.43.68 – 10.4.43.68	10.4.43.68
70	10.4.43.69/32	10.4.43.69 – 10.4.43.69	10.4.43.69
71	10.4.43.70/32	10.4.43.70 – 10.4.43.70	10.4.43.70
72	10.4.43.71/32	10.4.43.71 – 10.4.43.71	10.4.43.71
73	10.4.43.72/32	10.4.43.72 – 10.4.43.72	10.4.43.72
74	10.4.43.73/32	10.4.43.73 – 10.4.43.73	10.4.43.73
75	10.4.43.74/32	10.4.43.74 – 10.4.43.74	10.4.43.74
76	10.4.43.75/32	10.4.43.75 – 10.4.43.75	10.4.43.75
77	10.4.43.76/32	10.4.43.76 – 10.4.43.76	10.4.43.76
78	10.4.43.77/32	10.4.43.77 – 10.4.43.77	10.4.43.77
79	10.4.43.78/32	10.4.43.78 – 10.4.43.78	10.4.43.78
80	10.4.43.79/32	10.4.43.79 – 10.4.43.79	10.4.43.79
81	10.4.43.80/32	10.4.43.80 – 10.4.43.80	10.4.43.80
82	10.4.43.81/32	10.4.43.81 – 10.4.43.81	10.4.43.81
83	10.4.43.82/32	10.4.43.82 – 10.4.43.82	10.4.43.82
84	10.4.43.83/32	10.4.43.83 – 10.4.43.83	10.4.43.83
85	10.4.43.84/32	10.4.43.84 – 10.4.43.84	10.4.43.84
86	10.4.43.85/32	10.4.43.85 – 10.4.43.85	10.4.43.85
87	10.4.43.86/32	10.4.43.86 – 10.4.43.86	10.4.43.86
88	10.4.43.87/32	10.4.43.87 – 10.4.43.87	10.4.43.87
89	10.4.43.88/32	10.4.43.88 – 10.4.43.88	10.4.43.88
90	10.4.43.89/32	10.4.43.89 – 10.4.43.89	10.4.43.89
91	10.4.43.90/32	10.4.43.90 – 10.4.43.90	10.4.43.90
92	10.4.43.91/32	10.4.43.91 – 10.4.43.91	10.4.43.91
93	10.4.43.92/32	10.4.43.92 – 10.4.43.92	10.4.43.92
94	10.4.43.93/32	10.4.43.93 – 10.4.43.93	10.4.43.93
95	10.4.43.94/32	10.4.43.94 – 10.4.43.94	10.4.43.94
96	10.4.43.95/32	10.4.43.95 – 10.4.43.95	10.4.43.95
97	10.4.43.96/32	10.4.43.96 – 10.4.43.96	10.4.43.96
98	10.4.43.97/32	10.4.43.97 – 10.4.43.97	10.4.43.97
99	10.4.43.98/32	10.4.43.98 – 10.4.43.98	10.4.43.98
100	10.4.43.99/32	10.4.43.99 – 10.4.43.99	10.4.43.99
101	10.4.43.100/32	10.4.43.100 – 10.4.43.100	10.4.43.100
102	10.4.43.101/32	10.4.43.101 – 10.4.43.101	10.4.43.101
103	10.4.43.102/32	10.4.43.102 – 10.4.43.102	10.4.43.102
104	10.4.43.103/32	10.4.43.103 – 10.4.43.103	10.4.43.103
105	10.4.43.104/32	10.4.43.104 – 10.4.43.104	10.4.43.104
106	10.4.43.105/32	10.4.43.105 – 10.4.43.105	10.4.43.105
107	10.4.43.106/32	10.4.43.106 – 10.4.43.106	10.4.43.106
108	10.4.43.107/32	10.4.43.107 – 10.4.43.107	10.4.43.107
109	10.4.43.108/32	10.4.43.108 – 10.4.43.108	10.4.43.108
110	10.4.43.109/32	10.4.43.109 – 10.4.43.109	10.4.43.109
111	10.4.43.110/32	10.4.43.110 – 10.4.43.110	10.4.43.110
112	10.4.43.111/32	10.4.43.111 – 10.4.43.111	10.4.43.111
113	10.4.43.112/32	10.4.43.112 – 10.4.43.112	10.4.43.112
114	10.4.43.113/32	10.4.43.113 – 10.4.43.113	10.4.43.113
115	10.4.43.114/32	10.4.43.114 – 10.4.43.114	10.4.43.114
116	10.4.43.115/32	10.4.43.115 – 10.4.43.115	10.4.43.115
117	10.4.43.116/32	10.4.43.116 – 10.4.43.116	10.4.43.116
118	10.4.43.117/32	10.4.43.117 – 10.4.43.117	10.4.43.117
119	10.4.43.118/32	10.4.43.118 – 10.4.43.118	10.4.43.118
120	10.4.43.119/32	10.4.43.119 – 10.4.43.119	10.4.43.119
121	10.4.43.120/32	10.4.43.120 – 10.4.43.120	10.4.43.120
122	10.4.43.121/32	10.4.43.121 – 10.4.43.121	10.4.43.121
123	10.4.43.122/32	10.4.43.122 – 10.4.43.122	10.4.43.122
124	10.4.43.123/32	10.4.43.123 – 10.4.43.123	10.4.43.123
125	10.4.43.124/32	10.4.43.124 – 10.4.43.124	10.4.43.124
126	10.4.43.125/32	10.4.43.125 – 10.4.43.125	10.4.43.125
127	10.4.43.126/32	10.4.43.126 – 10.4.43.126	10.4.43.126
128	10.4.43.127/32	10.4.43.127 – 10.4.43.127	10.4.43.127

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 →