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)10.2.237.0/25

network10.2.237.0/25

broadcast10.2.237.127

first host10.2.237.1

last host10.2.237.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.237.0/25

address00001010.00000010.11101101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11101101.00000000

broadcast00001010.00000010.11101101.01111111

green = network part, grey = host part

hex0x0a02ed00

decimal167963904

reverse dns0.237.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ed00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.237.0/32	10.2.237.0 – 10.2.237.0	10.2.237.0
2	10.2.237.1/32	10.2.237.1 – 10.2.237.1	10.2.237.1
3	10.2.237.2/32	10.2.237.2 – 10.2.237.2	10.2.237.2
4	10.2.237.3/32	10.2.237.3 – 10.2.237.3	10.2.237.3
5	10.2.237.4/32	10.2.237.4 – 10.2.237.4	10.2.237.4
6	10.2.237.5/32	10.2.237.5 – 10.2.237.5	10.2.237.5
7	10.2.237.6/32	10.2.237.6 – 10.2.237.6	10.2.237.6
8	10.2.237.7/32	10.2.237.7 – 10.2.237.7	10.2.237.7
9	10.2.237.8/32	10.2.237.8 – 10.2.237.8	10.2.237.8
10	10.2.237.9/32	10.2.237.9 – 10.2.237.9	10.2.237.9
11	10.2.237.10/32	10.2.237.10 – 10.2.237.10	10.2.237.10
12	10.2.237.11/32	10.2.237.11 – 10.2.237.11	10.2.237.11
13	10.2.237.12/32	10.2.237.12 – 10.2.237.12	10.2.237.12
14	10.2.237.13/32	10.2.237.13 – 10.2.237.13	10.2.237.13
15	10.2.237.14/32	10.2.237.14 – 10.2.237.14	10.2.237.14
16	10.2.237.15/32	10.2.237.15 – 10.2.237.15	10.2.237.15
17	10.2.237.16/32	10.2.237.16 – 10.2.237.16	10.2.237.16
18	10.2.237.17/32	10.2.237.17 – 10.2.237.17	10.2.237.17
19	10.2.237.18/32	10.2.237.18 – 10.2.237.18	10.2.237.18
20	10.2.237.19/32	10.2.237.19 – 10.2.237.19	10.2.237.19
21	10.2.237.20/32	10.2.237.20 – 10.2.237.20	10.2.237.20
22	10.2.237.21/32	10.2.237.21 – 10.2.237.21	10.2.237.21
23	10.2.237.22/32	10.2.237.22 – 10.2.237.22	10.2.237.22
24	10.2.237.23/32	10.2.237.23 – 10.2.237.23	10.2.237.23
25	10.2.237.24/32	10.2.237.24 – 10.2.237.24	10.2.237.24
26	10.2.237.25/32	10.2.237.25 – 10.2.237.25	10.2.237.25
27	10.2.237.26/32	10.2.237.26 – 10.2.237.26	10.2.237.26
28	10.2.237.27/32	10.2.237.27 – 10.2.237.27	10.2.237.27
29	10.2.237.28/32	10.2.237.28 – 10.2.237.28	10.2.237.28
30	10.2.237.29/32	10.2.237.29 – 10.2.237.29	10.2.237.29
31	10.2.237.30/32	10.2.237.30 – 10.2.237.30	10.2.237.30
32	10.2.237.31/32	10.2.237.31 – 10.2.237.31	10.2.237.31
33	10.2.237.32/32	10.2.237.32 – 10.2.237.32	10.2.237.32
34	10.2.237.33/32	10.2.237.33 – 10.2.237.33	10.2.237.33
35	10.2.237.34/32	10.2.237.34 – 10.2.237.34	10.2.237.34
36	10.2.237.35/32	10.2.237.35 – 10.2.237.35	10.2.237.35
37	10.2.237.36/32	10.2.237.36 – 10.2.237.36	10.2.237.36
38	10.2.237.37/32	10.2.237.37 – 10.2.237.37	10.2.237.37
39	10.2.237.38/32	10.2.237.38 – 10.2.237.38	10.2.237.38
40	10.2.237.39/32	10.2.237.39 – 10.2.237.39	10.2.237.39
41	10.2.237.40/32	10.2.237.40 – 10.2.237.40	10.2.237.40
42	10.2.237.41/32	10.2.237.41 – 10.2.237.41	10.2.237.41
43	10.2.237.42/32	10.2.237.42 – 10.2.237.42	10.2.237.42
44	10.2.237.43/32	10.2.237.43 – 10.2.237.43	10.2.237.43
45	10.2.237.44/32	10.2.237.44 – 10.2.237.44	10.2.237.44
46	10.2.237.45/32	10.2.237.45 – 10.2.237.45	10.2.237.45
47	10.2.237.46/32	10.2.237.46 – 10.2.237.46	10.2.237.46
48	10.2.237.47/32	10.2.237.47 – 10.2.237.47	10.2.237.47
49	10.2.237.48/32	10.2.237.48 – 10.2.237.48	10.2.237.48
50	10.2.237.49/32	10.2.237.49 – 10.2.237.49	10.2.237.49
51	10.2.237.50/32	10.2.237.50 – 10.2.237.50	10.2.237.50
52	10.2.237.51/32	10.2.237.51 – 10.2.237.51	10.2.237.51
53	10.2.237.52/32	10.2.237.52 – 10.2.237.52	10.2.237.52
54	10.2.237.53/32	10.2.237.53 – 10.2.237.53	10.2.237.53
55	10.2.237.54/32	10.2.237.54 – 10.2.237.54	10.2.237.54
56	10.2.237.55/32	10.2.237.55 – 10.2.237.55	10.2.237.55
57	10.2.237.56/32	10.2.237.56 – 10.2.237.56	10.2.237.56
58	10.2.237.57/32	10.2.237.57 – 10.2.237.57	10.2.237.57
59	10.2.237.58/32	10.2.237.58 – 10.2.237.58	10.2.237.58
60	10.2.237.59/32	10.2.237.59 – 10.2.237.59	10.2.237.59
61	10.2.237.60/32	10.2.237.60 – 10.2.237.60	10.2.237.60
62	10.2.237.61/32	10.2.237.61 – 10.2.237.61	10.2.237.61
63	10.2.237.62/32	10.2.237.62 – 10.2.237.62	10.2.237.62
64	10.2.237.63/32	10.2.237.63 – 10.2.237.63	10.2.237.63
65	10.2.237.64/32	10.2.237.64 – 10.2.237.64	10.2.237.64
66	10.2.237.65/32	10.2.237.65 – 10.2.237.65	10.2.237.65
67	10.2.237.66/32	10.2.237.66 – 10.2.237.66	10.2.237.66
68	10.2.237.67/32	10.2.237.67 – 10.2.237.67	10.2.237.67
69	10.2.237.68/32	10.2.237.68 – 10.2.237.68	10.2.237.68
70	10.2.237.69/32	10.2.237.69 – 10.2.237.69	10.2.237.69
71	10.2.237.70/32	10.2.237.70 – 10.2.237.70	10.2.237.70
72	10.2.237.71/32	10.2.237.71 – 10.2.237.71	10.2.237.71
73	10.2.237.72/32	10.2.237.72 – 10.2.237.72	10.2.237.72
74	10.2.237.73/32	10.2.237.73 – 10.2.237.73	10.2.237.73
75	10.2.237.74/32	10.2.237.74 – 10.2.237.74	10.2.237.74
76	10.2.237.75/32	10.2.237.75 – 10.2.237.75	10.2.237.75
77	10.2.237.76/32	10.2.237.76 – 10.2.237.76	10.2.237.76
78	10.2.237.77/32	10.2.237.77 – 10.2.237.77	10.2.237.77
79	10.2.237.78/32	10.2.237.78 – 10.2.237.78	10.2.237.78
80	10.2.237.79/32	10.2.237.79 – 10.2.237.79	10.2.237.79
81	10.2.237.80/32	10.2.237.80 – 10.2.237.80	10.2.237.80
82	10.2.237.81/32	10.2.237.81 – 10.2.237.81	10.2.237.81
83	10.2.237.82/32	10.2.237.82 – 10.2.237.82	10.2.237.82
84	10.2.237.83/32	10.2.237.83 – 10.2.237.83	10.2.237.83
85	10.2.237.84/32	10.2.237.84 – 10.2.237.84	10.2.237.84
86	10.2.237.85/32	10.2.237.85 – 10.2.237.85	10.2.237.85
87	10.2.237.86/32	10.2.237.86 – 10.2.237.86	10.2.237.86
88	10.2.237.87/32	10.2.237.87 – 10.2.237.87	10.2.237.87
89	10.2.237.88/32	10.2.237.88 – 10.2.237.88	10.2.237.88
90	10.2.237.89/32	10.2.237.89 – 10.2.237.89	10.2.237.89
91	10.2.237.90/32	10.2.237.90 – 10.2.237.90	10.2.237.90
92	10.2.237.91/32	10.2.237.91 – 10.2.237.91	10.2.237.91
93	10.2.237.92/32	10.2.237.92 – 10.2.237.92	10.2.237.92
94	10.2.237.93/32	10.2.237.93 – 10.2.237.93	10.2.237.93
95	10.2.237.94/32	10.2.237.94 – 10.2.237.94	10.2.237.94
96	10.2.237.95/32	10.2.237.95 – 10.2.237.95	10.2.237.95
97	10.2.237.96/32	10.2.237.96 – 10.2.237.96	10.2.237.96
98	10.2.237.97/32	10.2.237.97 – 10.2.237.97	10.2.237.97
99	10.2.237.98/32	10.2.237.98 – 10.2.237.98	10.2.237.98
100	10.2.237.99/32	10.2.237.99 – 10.2.237.99	10.2.237.99
101	10.2.237.100/32	10.2.237.100 – 10.2.237.100	10.2.237.100
102	10.2.237.101/32	10.2.237.101 – 10.2.237.101	10.2.237.101
103	10.2.237.102/32	10.2.237.102 – 10.2.237.102	10.2.237.102
104	10.2.237.103/32	10.2.237.103 – 10.2.237.103	10.2.237.103
105	10.2.237.104/32	10.2.237.104 – 10.2.237.104	10.2.237.104
106	10.2.237.105/32	10.2.237.105 – 10.2.237.105	10.2.237.105
107	10.2.237.106/32	10.2.237.106 – 10.2.237.106	10.2.237.106
108	10.2.237.107/32	10.2.237.107 – 10.2.237.107	10.2.237.107
109	10.2.237.108/32	10.2.237.108 – 10.2.237.108	10.2.237.108
110	10.2.237.109/32	10.2.237.109 – 10.2.237.109	10.2.237.109
111	10.2.237.110/32	10.2.237.110 – 10.2.237.110	10.2.237.110
112	10.2.237.111/32	10.2.237.111 – 10.2.237.111	10.2.237.111
113	10.2.237.112/32	10.2.237.112 – 10.2.237.112	10.2.237.112
114	10.2.237.113/32	10.2.237.113 – 10.2.237.113	10.2.237.113
115	10.2.237.114/32	10.2.237.114 – 10.2.237.114	10.2.237.114
116	10.2.237.115/32	10.2.237.115 – 10.2.237.115	10.2.237.115
117	10.2.237.116/32	10.2.237.116 – 10.2.237.116	10.2.237.116
118	10.2.237.117/32	10.2.237.117 – 10.2.237.117	10.2.237.117
119	10.2.237.118/32	10.2.237.118 – 10.2.237.118	10.2.237.118
120	10.2.237.119/32	10.2.237.119 – 10.2.237.119	10.2.237.119
121	10.2.237.120/32	10.2.237.120 – 10.2.237.120	10.2.237.120
122	10.2.237.121/32	10.2.237.121 – 10.2.237.121	10.2.237.121
123	10.2.237.122/32	10.2.237.122 – 10.2.237.122	10.2.237.122
124	10.2.237.123/32	10.2.237.123 – 10.2.237.123	10.2.237.123
125	10.2.237.124/32	10.2.237.124 – 10.2.237.124	10.2.237.124
126	10.2.237.125/32	10.2.237.125 – 10.2.237.125	10.2.237.125
127	10.2.237.126/32	10.2.237.126 – 10.2.237.126	10.2.237.126
128	10.2.237.127/32	10.2.237.127 – 10.2.237.127	10.2.237.127

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 →