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)10.2.242.0/25

network10.2.242.0/25

broadcast10.2.242.127

first host10.2.242.1

last host10.2.242.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.242.0/25

address00001010.00000010.11110010.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11110010.00000000

broadcast00001010.00000010.11110010.01111111

green = network part, grey = host part

hex0x0a02f200

decimal167965184

reverse dns0.242.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f200

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.242.0/32	10.2.242.0 – 10.2.242.0	10.2.242.0
2	10.2.242.1/32	10.2.242.1 – 10.2.242.1	10.2.242.1
3	10.2.242.2/32	10.2.242.2 – 10.2.242.2	10.2.242.2
4	10.2.242.3/32	10.2.242.3 – 10.2.242.3	10.2.242.3
5	10.2.242.4/32	10.2.242.4 – 10.2.242.4	10.2.242.4
6	10.2.242.5/32	10.2.242.5 – 10.2.242.5	10.2.242.5
7	10.2.242.6/32	10.2.242.6 – 10.2.242.6	10.2.242.6
8	10.2.242.7/32	10.2.242.7 – 10.2.242.7	10.2.242.7
9	10.2.242.8/32	10.2.242.8 – 10.2.242.8	10.2.242.8
10	10.2.242.9/32	10.2.242.9 – 10.2.242.9	10.2.242.9
11	10.2.242.10/32	10.2.242.10 – 10.2.242.10	10.2.242.10
12	10.2.242.11/32	10.2.242.11 – 10.2.242.11	10.2.242.11
13	10.2.242.12/32	10.2.242.12 – 10.2.242.12	10.2.242.12
14	10.2.242.13/32	10.2.242.13 – 10.2.242.13	10.2.242.13
15	10.2.242.14/32	10.2.242.14 – 10.2.242.14	10.2.242.14
16	10.2.242.15/32	10.2.242.15 – 10.2.242.15	10.2.242.15
17	10.2.242.16/32	10.2.242.16 – 10.2.242.16	10.2.242.16
18	10.2.242.17/32	10.2.242.17 – 10.2.242.17	10.2.242.17
19	10.2.242.18/32	10.2.242.18 – 10.2.242.18	10.2.242.18
20	10.2.242.19/32	10.2.242.19 – 10.2.242.19	10.2.242.19
21	10.2.242.20/32	10.2.242.20 – 10.2.242.20	10.2.242.20
22	10.2.242.21/32	10.2.242.21 – 10.2.242.21	10.2.242.21
23	10.2.242.22/32	10.2.242.22 – 10.2.242.22	10.2.242.22
24	10.2.242.23/32	10.2.242.23 – 10.2.242.23	10.2.242.23
25	10.2.242.24/32	10.2.242.24 – 10.2.242.24	10.2.242.24
26	10.2.242.25/32	10.2.242.25 – 10.2.242.25	10.2.242.25
27	10.2.242.26/32	10.2.242.26 – 10.2.242.26	10.2.242.26
28	10.2.242.27/32	10.2.242.27 – 10.2.242.27	10.2.242.27
29	10.2.242.28/32	10.2.242.28 – 10.2.242.28	10.2.242.28
30	10.2.242.29/32	10.2.242.29 – 10.2.242.29	10.2.242.29
31	10.2.242.30/32	10.2.242.30 – 10.2.242.30	10.2.242.30
32	10.2.242.31/32	10.2.242.31 – 10.2.242.31	10.2.242.31
33	10.2.242.32/32	10.2.242.32 – 10.2.242.32	10.2.242.32
34	10.2.242.33/32	10.2.242.33 – 10.2.242.33	10.2.242.33
35	10.2.242.34/32	10.2.242.34 – 10.2.242.34	10.2.242.34
36	10.2.242.35/32	10.2.242.35 – 10.2.242.35	10.2.242.35
37	10.2.242.36/32	10.2.242.36 – 10.2.242.36	10.2.242.36
38	10.2.242.37/32	10.2.242.37 – 10.2.242.37	10.2.242.37
39	10.2.242.38/32	10.2.242.38 – 10.2.242.38	10.2.242.38
40	10.2.242.39/32	10.2.242.39 – 10.2.242.39	10.2.242.39
41	10.2.242.40/32	10.2.242.40 – 10.2.242.40	10.2.242.40
42	10.2.242.41/32	10.2.242.41 – 10.2.242.41	10.2.242.41
43	10.2.242.42/32	10.2.242.42 – 10.2.242.42	10.2.242.42
44	10.2.242.43/32	10.2.242.43 – 10.2.242.43	10.2.242.43
45	10.2.242.44/32	10.2.242.44 – 10.2.242.44	10.2.242.44
46	10.2.242.45/32	10.2.242.45 – 10.2.242.45	10.2.242.45
47	10.2.242.46/32	10.2.242.46 – 10.2.242.46	10.2.242.46
48	10.2.242.47/32	10.2.242.47 – 10.2.242.47	10.2.242.47
49	10.2.242.48/32	10.2.242.48 – 10.2.242.48	10.2.242.48
50	10.2.242.49/32	10.2.242.49 – 10.2.242.49	10.2.242.49
51	10.2.242.50/32	10.2.242.50 – 10.2.242.50	10.2.242.50
52	10.2.242.51/32	10.2.242.51 – 10.2.242.51	10.2.242.51
53	10.2.242.52/32	10.2.242.52 – 10.2.242.52	10.2.242.52
54	10.2.242.53/32	10.2.242.53 – 10.2.242.53	10.2.242.53
55	10.2.242.54/32	10.2.242.54 – 10.2.242.54	10.2.242.54
56	10.2.242.55/32	10.2.242.55 – 10.2.242.55	10.2.242.55
57	10.2.242.56/32	10.2.242.56 – 10.2.242.56	10.2.242.56
58	10.2.242.57/32	10.2.242.57 – 10.2.242.57	10.2.242.57
59	10.2.242.58/32	10.2.242.58 – 10.2.242.58	10.2.242.58
60	10.2.242.59/32	10.2.242.59 – 10.2.242.59	10.2.242.59
61	10.2.242.60/32	10.2.242.60 – 10.2.242.60	10.2.242.60
62	10.2.242.61/32	10.2.242.61 – 10.2.242.61	10.2.242.61
63	10.2.242.62/32	10.2.242.62 – 10.2.242.62	10.2.242.62
64	10.2.242.63/32	10.2.242.63 – 10.2.242.63	10.2.242.63
65	10.2.242.64/32	10.2.242.64 – 10.2.242.64	10.2.242.64
66	10.2.242.65/32	10.2.242.65 – 10.2.242.65	10.2.242.65
67	10.2.242.66/32	10.2.242.66 – 10.2.242.66	10.2.242.66
68	10.2.242.67/32	10.2.242.67 – 10.2.242.67	10.2.242.67
69	10.2.242.68/32	10.2.242.68 – 10.2.242.68	10.2.242.68
70	10.2.242.69/32	10.2.242.69 – 10.2.242.69	10.2.242.69
71	10.2.242.70/32	10.2.242.70 – 10.2.242.70	10.2.242.70
72	10.2.242.71/32	10.2.242.71 – 10.2.242.71	10.2.242.71
73	10.2.242.72/32	10.2.242.72 – 10.2.242.72	10.2.242.72
74	10.2.242.73/32	10.2.242.73 – 10.2.242.73	10.2.242.73
75	10.2.242.74/32	10.2.242.74 – 10.2.242.74	10.2.242.74
76	10.2.242.75/32	10.2.242.75 – 10.2.242.75	10.2.242.75
77	10.2.242.76/32	10.2.242.76 – 10.2.242.76	10.2.242.76
78	10.2.242.77/32	10.2.242.77 – 10.2.242.77	10.2.242.77
79	10.2.242.78/32	10.2.242.78 – 10.2.242.78	10.2.242.78
80	10.2.242.79/32	10.2.242.79 – 10.2.242.79	10.2.242.79
81	10.2.242.80/32	10.2.242.80 – 10.2.242.80	10.2.242.80
82	10.2.242.81/32	10.2.242.81 – 10.2.242.81	10.2.242.81
83	10.2.242.82/32	10.2.242.82 – 10.2.242.82	10.2.242.82
84	10.2.242.83/32	10.2.242.83 – 10.2.242.83	10.2.242.83
85	10.2.242.84/32	10.2.242.84 – 10.2.242.84	10.2.242.84
86	10.2.242.85/32	10.2.242.85 – 10.2.242.85	10.2.242.85
87	10.2.242.86/32	10.2.242.86 – 10.2.242.86	10.2.242.86
88	10.2.242.87/32	10.2.242.87 – 10.2.242.87	10.2.242.87
89	10.2.242.88/32	10.2.242.88 – 10.2.242.88	10.2.242.88
90	10.2.242.89/32	10.2.242.89 – 10.2.242.89	10.2.242.89
91	10.2.242.90/32	10.2.242.90 – 10.2.242.90	10.2.242.90
92	10.2.242.91/32	10.2.242.91 – 10.2.242.91	10.2.242.91
93	10.2.242.92/32	10.2.242.92 – 10.2.242.92	10.2.242.92
94	10.2.242.93/32	10.2.242.93 – 10.2.242.93	10.2.242.93
95	10.2.242.94/32	10.2.242.94 – 10.2.242.94	10.2.242.94
96	10.2.242.95/32	10.2.242.95 – 10.2.242.95	10.2.242.95
97	10.2.242.96/32	10.2.242.96 – 10.2.242.96	10.2.242.96
98	10.2.242.97/32	10.2.242.97 – 10.2.242.97	10.2.242.97
99	10.2.242.98/32	10.2.242.98 – 10.2.242.98	10.2.242.98
100	10.2.242.99/32	10.2.242.99 – 10.2.242.99	10.2.242.99
101	10.2.242.100/32	10.2.242.100 – 10.2.242.100	10.2.242.100
102	10.2.242.101/32	10.2.242.101 – 10.2.242.101	10.2.242.101
103	10.2.242.102/32	10.2.242.102 – 10.2.242.102	10.2.242.102
104	10.2.242.103/32	10.2.242.103 – 10.2.242.103	10.2.242.103
105	10.2.242.104/32	10.2.242.104 – 10.2.242.104	10.2.242.104
106	10.2.242.105/32	10.2.242.105 – 10.2.242.105	10.2.242.105
107	10.2.242.106/32	10.2.242.106 – 10.2.242.106	10.2.242.106
108	10.2.242.107/32	10.2.242.107 – 10.2.242.107	10.2.242.107
109	10.2.242.108/32	10.2.242.108 – 10.2.242.108	10.2.242.108
110	10.2.242.109/32	10.2.242.109 – 10.2.242.109	10.2.242.109
111	10.2.242.110/32	10.2.242.110 – 10.2.242.110	10.2.242.110
112	10.2.242.111/32	10.2.242.111 – 10.2.242.111	10.2.242.111
113	10.2.242.112/32	10.2.242.112 – 10.2.242.112	10.2.242.112
114	10.2.242.113/32	10.2.242.113 – 10.2.242.113	10.2.242.113
115	10.2.242.114/32	10.2.242.114 – 10.2.242.114	10.2.242.114
116	10.2.242.115/32	10.2.242.115 – 10.2.242.115	10.2.242.115
117	10.2.242.116/32	10.2.242.116 – 10.2.242.116	10.2.242.116
118	10.2.242.117/32	10.2.242.117 – 10.2.242.117	10.2.242.117
119	10.2.242.118/32	10.2.242.118 – 10.2.242.118	10.2.242.118
120	10.2.242.119/32	10.2.242.119 – 10.2.242.119	10.2.242.119
121	10.2.242.120/32	10.2.242.120 – 10.2.242.120	10.2.242.120
122	10.2.242.121/32	10.2.242.121 – 10.2.242.121	10.2.242.121
123	10.2.242.122/32	10.2.242.122 – 10.2.242.122	10.2.242.122
124	10.2.242.123/32	10.2.242.123 – 10.2.242.123	10.2.242.123
125	10.2.242.124/32	10.2.242.124 – 10.2.242.124	10.2.242.124
126	10.2.242.125/32	10.2.242.125 – 10.2.242.125	10.2.242.125
127	10.2.242.126/32	10.2.242.126 – 10.2.242.126	10.2.242.126
128	10.2.242.127/32	10.2.242.127 – 10.2.242.127	10.2.242.127

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 →