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)10.35.87.0/25

network10.35.87.0/25

broadcast10.35.87.127

first host10.35.87.1

last host10.35.87.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.35.87.0/25

address00001010.00100011.01010111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00100011.01010111.00000000

broadcast00001010.00100011.01010111.01111111

green = network part, grey = host part

hex0x0a235700

decimal170088192

reverse dns0.87.35.10.in-addr.arpa

ipv4-mapped::ffff:a23:5700

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.35.87.0/32	10.35.87.0 – 10.35.87.0	10.35.87.0
2	10.35.87.1/32	10.35.87.1 – 10.35.87.1	10.35.87.1
3	10.35.87.2/32	10.35.87.2 – 10.35.87.2	10.35.87.2
4	10.35.87.3/32	10.35.87.3 – 10.35.87.3	10.35.87.3
5	10.35.87.4/32	10.35.87.4 – 10.35.87.4	10.35.87.4
6	10.35.87.5/32	10.35.87.5 – 10.35.87.5	10.35.87.5
7	10.35.87.6/32	10.35.87.6 – 10.35.87.6	10.35.87.6
8	10.35.87.7/32	10.35.87.7 – 10.35.87.7	10.35.87.7
9	10.35.87.8/32	10.35.87.8 – 10.35.87.8	10.35.87.8
10	10.35.87.9/32	10.35.87.9 – 10.35.87.9	10.35.87.9
11	10.35.87.10/32	10.35.87.10 – 10.35.87.10	10.35.87.10
12	10.35.87.11/32	10.35.87.11 – 10.35.87.11	10.35.87.11
13	10.35.87.12/32	10.35.87.12 – 10.35.87.12	10.35.87.12
14	10.35.87.13/32	10.35.87.13 – 10.35.87.13	10.35.87.13
15	10.35.87.14/32	10.35.87.14 – 10.35.87.14	10.35.87.14
16	10.35.87.15/32	10.35.87.15 – 10.35.87.15	10.35.87.15
17	10.35.87.16/32	10.35.87.16 – 10.35.87.16	10.35.87.16
18	10.35.87.17/32	10.35.87.17 – 10.35.87.17	10.35.87.17
19	10.35.87.18/32	10.35.87.18 – 10.35.87.18	10.35.87.18
20	10.35.87.19/32	10.35.87.19 – 10.35.87.19	10.35.87.19
21	10.35.87.20/32	10.35.87.20 – 10.35.87.20	10.35.87.20
22	10.35.87.21/32	10.35.87.21 – 10.35.87.21	10.35.87.21
23	10.35.87.22/32	10.35.87.22 – 10.35.87.22	10.35.87.22
24	10.35.87.23/32	10.35.87.23 – 10.35.87.23	10.35.87.23
25	10.35.87.24/32	10.35.87.24 – 10.35.87.24	10.35.87.24
26	10.35.87.25/32	10.35.87.25 – 10.35.87.25	10.35.87.25
27	10.35.87.26/32	10.35.87.26 – 10.35.87.26	10.35.87.26
28	10.35.87.27/32	10.35.87.27 – 10.35.87.27	10.35.87.27
29	10.35.87.28/32	10.35.87.28 – 10.35.87.28	10.35.87.28
30	10.35.87.29/32	10.35.87.29 – 10.35.87.29	10.35.87.29
31	10.35.87.30/32	10.35.87.30 – 10.35.87.30	10.35.87.30
32	10.35.87.31/32	10.35.87.31 – 10.35.87.31	10.35.87.31
33	10.35.87.32/32	10.35.87.32 – 10.35.87.32	10.35.87.32
34	10.35.87.33/32	10.35.87.33 – 10.35.87.33	10.35.87.33
35	10.35.87.34/32	10.35.87.34 – 10.35.87.34	10.35.87.34
36	10.35.87.35/32	10.35.87.35 – 10.35.87.35	10.35.87.35
37	10.35.87.36/32	10.35.87.36 – 10.35.87.36	10.35.87.36
38	10.35.87.37/32	10.35.87.37 – 10.35.87.37	10.35.87.37
39	10.35.87.38/32	10.35.87.38 – 10.35.87.38	10.35.87.38
40	10.35.87.39/32	10.35.87.39 – 10.35.87.39	10.35.87.39
41	10.35.87.40/32	10.35.87.40 – 10.35.87.40	10.35.87.40
42	10.35.87.41/32	10.35.87.41 – 10.35.87.41	10.35.87.41
43	10.35.87.42/32	10.35.87.42 – 10.35.87.42	10.35.87.42
44	10.35.87.43/32	10.35.87.43 – 10.35.87.43	10.35.87.43
45	10.35.87.44/32	10.35.87.44 – 10.35.87.44	10.35.87.44
46	10.35.87.45/32	10.35.87.45 – 10.35.87.45	10.35.87.45
47	10.35.87.46/32	10.35.87.46 – 10.35.87.46	10.35.87.46
48	10.35.87.47/32	10.35.87.47 – 10.35.87.47	10.35.87.47
49	10.35.87.48/32	10.35.87.48 – 10.35.87.48	10.35.87.48
50	10.35.87.49/32	10.35.87.49 – 10.35.87.49	10.35.87.49
51	10.35.87.50/32	10.35.87.50 – 10.35.87.50	10.35.87.50
52	10.35.87.51/32	10.35.87.51 – 10.35.87.51	10.35.87.51
53	10.35.87.52/32	10.35.87.52 – 10.35.87.52	10.35.87.52
54	10.35.87.53/32	10.35.87.53 – 10.35.87.53	10.35.87.53
55	10.35.87.54/32	10.35.87.54 – 10.35.87.54	10.35.87.54
56	10.35.87.55/32	10.35.87.55 – 10.35.87.55	10.35.87.55
57	10.35.87.56/32	10.35.87.56 – 10.35.87.56	10.35.87.56
58	10.35.87.57/32	10.35.87.57 – 10.35.87.57	10.35.87.57
59	10.35.87.58/32	10.35.87.58 – 10.35.87.58	10.35.87.58
60	10.35.87.59/32	10.35.87.59 – 10.35.87.59	10.35.87.59
61	10.35.87.60/32	10.35.87.60 – 10.35.87.60	10.35.87.60
62	10.35.87.61/32	10.35.87.61 – 10.35.87.61	10.35.87.61
63	10.35.87.62/32	10.35.87.62 – 10.35.87.62	10.35.87.62
64	10.35.87.63/32	10.35.87.63 – 10.35.87.63	10.35.87.63
65	10.35.87.64/32	10.35.87.64 – 10.35.87.64	10.35.87.64
66	10.35.87.65/32	10.35.87.65 – 10.35.87.65	10.35.87.65
67	10.35.87.66/32	10.35.87.66 – 10.35.87.66	10.35.87.66
68	10.35.87.67/32	10.35.87.67 – 10.35.87.67	10.35.87.67
69	10.35.87.68/32	10.35.87.68 – 10.35.87.68	10.35.87.68
70	10.35.87.69/32	10.35.87.69 – 10.35.87.69	10.35.87.69
71	10.35.87.70/32	10.35.87.70 – 10.35.87.70	10.35.87.70
72	10.35.87.71/32	10.35.87.71 – 10.35.87.71	10.35.87.71
73	10.35.87.72/32	10.35.87.72 – 10.35.87.72	10.35.87.72
74	10.35.87.73/32	10.35.87.73 – 10.35.87.73	10.35.87.73
75	10.35.87.74/32	10.35.87.74 – 10.35.87.74	10.35.87.74
76	10.35.87.75/32	10.35.87.75 – 10.35.87.75	10.35.87.75
77	10.35.87.76/32	10.35.87.76 – 10.35.87.76	10.35.87.76
78	10.35.87.77/32	10.35.87.77 – 10.35.87.77	10.35.87.77
79	10.35.87.78/32	10.35.87.78 – 10.35.87.78	10.35.87.78
80	10.35.87.79/32	10.35.87.79 – 10.35.87.79	10.35.87.79
81	10.35.87.80/32	10.35.87.80 – 10.35.87.80	10.35.87.80
82	10.35.87.81/32	10.35.87.81 – 10.35.87.81	10.35.87.81
83	10.35.87.82/32	10.35.87.82 – 10.35.87.82	10.35.87.82
84	10.35.87.83/32	10.35.87.83 – 10.35.87.83	10.35.87.83
85	10.35.87.84/32	10.35.87.84 – 10.35.87.84	10.35.87.84
86	10.35.87.85/32	10.35.87.85 – 10.35.87.85	10.35.87.85
87	10.35.87.86/32	10.35.87.86 – 10.35.87.86	10.35.87.86
88	10.35.87.87/32	10.35.87.87 – 10.35.87.87	10.35.87.87
89	10.35.87.88/32	10.35.87.88 – 10.35.87.88	10.35.87.88
90	10.35.87.89/32	10.35.87.89 – 10.35.87.89	10.35.87.89
91	10.35.87.90/32	10.35.87.90 – 10.35.87.90	10.35.87.90
92	10.35.87.91/32	10.35.87.91 – 10.35.87.91	10.35.87.91
93	10.35.87.92/32	10.35.87.92 – 10.35.87.92	10.35.87.92
94	10.35.87.93/32	10.35.87.93 – 10.35.87.93	10.35.87.93
95	10.35.87.94/32	10.35.87.94 – 10.35.87.94	10.35.87.94
96	10.35.87.95/32	10.35.87.95 – 10.35.87.95	10.35.87.95
97	10.35.87.96/32	10.35.87.96 – 10.35.87.96	10.35.87.96
98	10.35.87.97/32	10.35.87.97 – 10.35.87.97	10.35.87.97
99	10.35.87.98/32	10.35.87.98 – 10.35.87.98	10.35.87.98
100	10.35.87.99/32	10.35.87.99 – 10.35.87.99	10.35.87.99
101	10.35.87.100/32	10.35.87.100 – 10.35.87.100	10.35.87.100
102	10.35.87.101/32	10.35.87.101 – 10.35.87.101	10.35.87.101
103	10.35.87.102/32	10.35.87.102 – 10.35.87.102	10.35.87.102
104	10.35.87.103/32	10.35.87.103 – 10.35.87.103	10.35.87.103
105	10.35.87.104/32	10.35.87.104 – 10.35.87.104	10.35.87.104
106	10.35.87.105/32	10.35.87.105 – 10.35.87.105	10.35.87.105
107	10.35.87.106/32	10.35.87.106 – 10.35.87.106	10.35.87.106
108	10.35.87.107/32	10.35.87.107 – 10.35.87.107	10.35.87.107
109	10.35.87.108/32	10.35.87.108 – 10.35.87.108	10.35.87.108
110	10.35.87.109/32	10.35.87.109 – 10.35.87.109	10.35.87.109
111	10.35.87.110/32	10.35.87.110 – 10.35.87.110	10.35.87.110
112	10.35.87.111/32	10.35.87.111 – 10.35.87.111	10.35.87.111
113	10.35.87.112/32	10.35.87.112 – 10.35.87.112	10.35.87.112
114	10.35.87.113/32	10.35.87.113 – 10.35.87.113	10.35.87.113
115	10.35.87.114/32	10.35.87.114 – 10.35.87.114	10.35.87.114
116	10.35.87.115/32	10.35.87.115 – 10.35.87.115	10.35.87.115
117	10.35.87.116/32	10.35.87.116 – 10.35.87.116	10.35.87.116
118	10.35.87.117/32	10.35.87.117 – 10.35.87.117	10.35.87.117
119	10.35.87.118/32	10.35.87.118 – 10.35.87.118	10.35.87.118
120	10.35.87.119/32	10.35.87.119 – 10.35.87.119	10.35.87.119
121	10.35.87.120/32	10.35.87.120 – 10.35.87.120	10.35.87.120
122	10.35.87.121/32	10.35.87.121 – 10.35.87.121	10.35.87.121
123	10.35.87.122/32	10.35.87.122 – 10.35.87.122	10.35.87.122
124	10.35.87.123/32	10.35.87.123 – 10.35.87.123	10.35.87.123
125	10.35.87.124/32	10.35.87.124 – 10.35.87.124	10.35.87.124
126	10.35.87.125/32	10.35.87.125 – 10.35.87.125	10.35.87.125
127	10.35.87.126/32	10.35.87.126 – 10.35.87.126	10.35.87.126
128	10.35.87.127/32	10.35.87.127 – 10.35.87.127	10.35.87.127

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 →