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)10.4.35.0/25

network10.4.35.0/25

broadcast10.4.35.127

first host10.4.35.1

last host10.4.35.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.4.35.0/25

address00001010.00000100.00100011.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000100.00100011.00000000

broadcast00001010.00000100.00100011.01111111

green = network part, grey = host part

hex0x0a042300

decimal168043264

reverse dns0.35.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:2300

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.35.0/32	10.4.35.0 – 10.4.35.0	10.4.35.0
2	10.4.35.1/32	10.4.35.1 – 10.4.35.1	10.4.35.1
3	10.4.35.2/32	10.4.35.2 – 10.4.35.2	10.4.35.2
4	10.4.35.3/32	10.4.35.3 – 10.4.35.3	10.4.35.3
5	10.4.35.4/32	10.4.35.4 – 10.4.35.4	10.4.35.4
6	10.4.35.5/32	10.4.35.5 – 10.4.35.5	10.4.35.5
7	10.4.35.6/32	10.4.35.6 – 10.4.35.6	10.4.35.6
8	10.4.35.7/32	10.4.35.7 – 10.4.35.7	10.4.35.7
9	10.4.35.8/32	10.4.35.8 – 10.4.35.8	10.4.35.8
10	10.4.35.9/32	10.4.35.9 – 10.4.35.9	10.4.35.9
11	10.4.35.10/32	10.4.35.10 – 10.4.35.10	10.4.35.10
12	10.4.35.11/32	10.4.35.11 – 10.4.35.11	10.4.35.11
13	10.4.35.12/32	10.4.35.12 – 10.4.35.12	10.4.35.12
14	10.4.35.13/32	10.4.35.13 – 10.4.35.13	10.4.35.13
15	10.4.35.14/32	10.4.35.14 – 10.4.35.14	10.4.35.14
16	10.4.35.15/32	10.4.35.15 – 10.4.35.15	10.4.35.15
17	10.4.35.16/32	10.4.35.16 – 10.4.35.16	10.4.35.16
18	10.4.35.17/32	10.4.35.17 – 10.4.35.17	10.4.35.17
19	10.4.35.18/32	10.4.35.18 – 10.4.35.18	10.4.35.18
20	10.4.35.19/32	10.4.35.19 – 10.4.35.19	10.4.35.19
21	10.4.35.20/32	10.4.35.20 – 10.4.35.20	10.4.35.20
22	10.4.35.21/32	10.4.35.21 – 10.4.35.21	10.4.35.21
23	10.4.35.22/32	10.4.35.22 – 10.4.35.22	10.4.35.22
24	10.4.35.23/32	10.4.35.23 – 10.4.35.23	10.4.35.23
25	10.4.35.24/32	10.4.35.24 – 10.4.35.24	10.4.35.24
26	10.4.35.25/32	10.4.35.25 – 10.4.35.25	10.4.35.25
27	10.4.35.26/32	10.4.35.26 – 10.4.35.26	10.4.35.26
28	10.4.35.27/32	10.4.35.27 – 10.4.35.27	10.4.35.27
29	10.4.35.28/32	10.4.35.28 – 10.4.35.28	10.4.35.28
30	10.4.35.29/32	10.4.35.29 – 10.4.35.29	10.4.35.29
31	10.4.35.30/32	10.4.35.30 – 10.4.35.30	10.4.35.30
32	10.4.35.31/32	10.4.35.31 – 10.4.35.31	10.4.35.31
33	10.4.35.32/32	10.4.35.32 – 10.4.35.32	10.4.35.32
34	10.4.35.33/32	10.4.35.33 – 10.4.35.33	10.4.35.33
35	10.4.35.34/32	10.4.35.34 – 10.4.35.34	10.4.35.34
36	10.4.35.35/32	10.4.35.35 – 10.4.35.35	10.4.35.35
37	10.4.35.36/32	10.4.35.36 – 10.4.35.36	10.4.35.36
38	10.4.35.37/32	10.4.35.37 – 10.4.35.37	10.4.35.37
39	10.4.35.38/32	10.4.35.38 – 10.4.35.38	10.4.35.38
40	10.4.35.39/32	10.4.35.39 – 10.4.35.39	10.4.35.39
41	10.4.35.40/32	10.4.35.40 – 10.4.35.40	10.4.35.40
42	10.4.35.41/32	10.4.35.41 – 10.4.35.41	10.4.35.41
43	10.4.35.42/32	10.4.35.42 – 10.4.35.42	10.4.35.42
44	10.4.35.43/32	10.4.35.43 – 10.4.35.43	10.4.35.43
45	10.4.35.44/32	10.4.35.44 – 10.4.35.44	10.4.35.44
46	10.4.35.45/32	10.4.35.45 – 10.4.35.45	10.4.35.45
47	10.4.35.46/32	10.4.35.46 – 10.4.35.46	10.4.35.46
48	10.4.35.47/32	10.4.35.47 – 10.4.35.47	10.4.35.47
49	10.4.35.48/32	10.4.35.48 – 10.4.35.48	10.4.35.48
50	10.4.35.49/32	10.4.35.49 – 10.4.35.49	10.4.35.49
51	10.4.35.50/32	10.4.35.50 – 10.4.35.50	10.4.35.50
52	10.4.35.51/32	10.4.35.51 – 10.4.35.51	10.4.35.51
53	10.4.35.52/32	10.4.35.52 – 10.4.35.52	10.4.35.52
54	10.4.35.53/32	10.4.35.53 – 10.4.35.53	10.4.35.53
55	10.4.35.54/32	10.4.35.54 – 10.4.35.54	10.4.35.54
56	10.4.35.55/32	10.4.35.55 – 10.4.35.55	10.4.35.55
57	10.4.35.56/32	10.4.35.56 – 10.4.35.56	10.4.35.56
58	10.4.35.57/32	10.4.35.57 – 10.4.35.57	10.4.35.57
59	10.4.35.58/32	10.4.35.58 – 10.4.35.58	10.4.35.58
60	10.4.35.59/32	10.4.35.59 – 10.4.35.59	10.4.35.59
61	10.4.35.60/32	10.4.35.60 – 10.4.35.60	10.4.35.60
62	10.4.35.61/32	10.4.35.61 – 10.4.35.61	10.4.35.61
63	10.4.35.62/32	10.4.35.62 – 10.4.35.62	10.4.35.62
64	10.4.35.63/32	10.4.35.63 – 10.4.35.63	10.4.35.63
65	10.4.35.64/32	10.4.35.64 – 10.4.35.64	10.4.35.64
66	10.4.35.65/32	10.4.35.65 – 10.4.35.65	10.4.35.65
67	10.4.35.66/32	10.4.35.66 – 10.4.35.66	10.4.35.66
68	10.4.35.67/32	10.4.35.67 – 10.4.35.67	10.4.35.67
69	10.4.35.68/32	10.4.35.68 – 10.4.35.68	10.4.35.68
70	10.4.35.69/32	10.4.35.69 – 10.4.35.69	10.4.35.69
71	10.4.35.70/32	10.4.35.70 – 10.4.35.70	10.4.35.70
72	10.4.35.71/32	10.4.35.71 – 10.4.35.71	10.4.35.71
73	10.4.35.72/32	10.4.35.72 – 10.4.35.72	10.4.35.72
74	10.4.35.73/32	10.4.35.73 – 10.4.35.73	10.4.35.73
75	10.4.35.74/32	10.4.35.74 – 10.4.35.74	10.4.35.74
76	10.4.35.75/32	10.4.35.75 – 10.4.35.75	10.4.35.75
77	10.4.35.76/32	10.4.35.76 – 10.4.35.76	10.4.35.76
78	10.4.35.77/32	10.4.35.77 – 10.4.35.77	10.4.35.77
79	10.4.35.78/32	10.4.35.78 – 10.4.35.78	10.4.35.78
80	10.4.35.79/32	10.4.35.79 – 10.4.35.79	10.4.35.79
81	10.4.35.80/32	10.4.35.80 – 10.4.35.80	10.4.35.80
82	10.4.35.81/32	10.4.35.81 – 10.4.35.81	10.4.35.81
83	10.4.35.82/32	10.4.35.82 – 10.4.35.82	10.4.35.82
84	10.4.35.83/32	10.4.35.83 – 10.4.35.83	10.4.35.83
85	10.4.35.84/32	10.4.35.84 – 10.4.35.84	10.4.35.84
86	10.4.35.85/32	10.4.35.85 – 10.4.35.85	10.4.35.85
87	10.4.35.86/32	10.4.35.86 – 10.4.35.86	10.4.35.86
88	10.4.35.87/32	10.4.35.87 – 10.4.35.87	10.4.35.87
89	10.4.35.88/32	10.4.35.88 – 10.4.35.88	10.4.35.88
90	10.4.35.89/32	10.4.35.89 – 10.4.35.89	10.4.35.89
91	10.4.35.90/32	10.4.35.90 – 10.4.35.90	10.4.35.90
92	10.4.35.91/32	10.4.35.91 – 10.4.35.91	10.4.35.91
93	10.4.35.92/32	10.4.35.92 – 10.4.35.92	10.4.35.92
94	10.4.35.93/32	10.4.35.93 – 10.4.35.93	10.4.35.93
95	10.4.35.94/32	10.4.35.94 – 10.4.35.94	10.4.35.94
96	10.4.35.95/32	10.4.35.95 – 10.4.35.95	10.4.35.95
97	10.4.35.96/32	10.4.35.96 – 10.4.35.96	10.4.35.96
98	10.4.35.97/32	10.4.35.97 – 10.4.35.97	10.4.35.97
99	10.4.35.98/32	10.4.35.98 – 10.4.35.98	10.4.35.98
100	10.4.35.99/32	10.4.35.99 – 10.4.35.99	10.4.35.99
101	10.4.35.100/32	10.4.35.100 – 10.4.35.100	10.4.35.100
102	10.4.35.101/32	10.4.35.101 – 10.4.35.101	10.4.35.101
103	10.4.35.102/32	10.4.35.102 – 10.4.35.102	10.4.35.102
104	10.4.35.103/32	10.4.35.103 – 10.4.35.103	10.4.35.103
105	10.4.35.104/32	10.4.35.104 – 10.4.35.104	10.4.35.104
106	10.4.35.105/32	10.4.35.105 – 10.4.35.105	10.4.35.105
107	10.4.35.106/32	10.4.35.106 – 10.4.35.106	10.4.35.106
108	10.4.35.107/32	10.4.35.107 – 10.4.35.107	10.4.35.107
109	10.4.35.108/32	10.4.35.108 – 10.4.35.108	10.4.35.108
110	10.4.35.109/32	10.4.35.109 – 10.4.35.109	10.4.35.109
111	10.4.35.110/32	10.4.35.110 – 10.4.35.110	10.4.35.110
112	10.4.35.111/32	10.4.35.111 – 10.4.35.111	10.4.35.111
113	10.4.35.112/32	10.4.35.112 – 10.4.35.112	10.4.35.112
114	10.4.35.113/32	10.4.35.113 – 10.4.35.113	10.4.35.113
115	10.4.35.114/32	10.4.35.114 – 10.4.35.114	10.4.35.114
116	10.4.35.115/32	10.4.35.115 – 10.4.35.115	10.4.35.115
117	10.4.35.116/32	10.4.35.116 – 10.4.35.116	10.4.35.116
118	10.4.35.117/32	10.4.35.117 – 10.4.35.117	10.4.35.117
119	10.4.35.118/32	10.4.35.118 – 10.4.35.118	10.4.35.118
120	10.4.35.119/32	10.4.35.119 – 10.4.35.119	10.4.35.119
121	10.4.35.120/32	10.4.35.120 – 10.4.35.120	10.4.35.120
122	10.4.35.121/32	10.4.35.121 – 10.4.35.121	10.4.35.121
123	10.4.35.122/32	10.4.35.122 – 10.4.35.122	10.4.35.122
124	10.4.35.123/32	10.4.35.123 – 10.4.35.123	10.4.35.123
125	10.4.35.124/32	10.4.35.124 – 10.4.35.124	10.4.35.124
126	10.4.35.125/32	10.4.35.125 – 10.4.35.125	10.4.35.125
127	10.4.35.126/32	10.4.35.126 – 10.4.35.126	10.4.35.126
128	10.4.35.127/32	10.4.35.127 – 10.4.35.127	10.4.35.127

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 →