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)10.2.241.0/25

network10.2.241.0/25

broadcast10.2.241.127

first host10.2.241.1

last host10.2.241.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.241.0/25

address00001010.00000010.11110001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.11110001.00000000

broadcast00001010.00000010.11110001.01111111

green = network part, grey = host part

hex0x0a02f100

decimal167964928

reverse dns0.241.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.241.0/32	10.2.241.0 – 10.2.241.0	10.2.241.0
2	10.2.241.1/32	10.2.241.1 – 10.2.241.1	10.2.241.1
3	10.2.241.2/32	10.2.241.2 – 10.2.241.2	10.2.241.2
4	10.2.241.3/32	10.2.241.3 – 10.2.241.3	10.2.241.3
5	10.2.241.4/32	10.2.241.4 – 10.2.241.4	10.2.241.4
6	10.2.241.5/32	10.2.241.5 – 10.2.241.5	10.2.241.5
7	10.2.241.6/32	10.2.241.6 – 10.2.241.6	10.2.241.6
8	10.2.241.7/32	10.2.241.7 – 10.2.241.7	10.2.241.7
9	10.2.241.8/32	10.2.241.8 – 10.2.241.8	10.2.241.8
10	10.2.241.9/32	10.2.241.9 – 10.2.241.9	10.2.241.9
11	10.2.241.10/32	10.2.241.10 – 10.2.241.10	10.2.241.10
12	10.2.241.11/32	10.2.241.11 – 10.2.241.11	10.2.241.11
13	10.2.241.12/32	10.2.241.12 – 10.2.241.12	10.2.241.12
14	10.2.241.13/32	10.2.241.13 – 10.2.241.13	10.2.241.13
15	10.2.241.14/32	10.2.241.14 – 10.2.241.14	10.2.241.14
16	10.2.241.15/32	10.2.241.15 – 10.2.241.15	10.2.241.15
17	10.2.241.16/32	10.2.241.16 – 10.2.241.16	10.2.241.16
18	10.2.241.17/32	10.2.241.17 – 10.2.241.17	10.2.241.17
19	10.2.241.18/32	10.2.241.18 – 10.2.241.18	10.2.241.18
20	10.2.241.19/32	10.2.241.19 – 10.2.241.19	10.2.241.19
21	10.2.241.20/32	10.2.241.20 – 10.2.241.20	10.2.241.20
22	10.2.241.21/32	10.2.241.21 – 10.2.241.21	10.2.241.21
23	10.2.241.22/32	10.2.241.22 – 10.2.241.22	10.2.241.22
24	10.2.241.23/32	10.2.241.23 – 10.2.241.23	10.2.241.23
25	10.2.241.24/32	10.2.241.24 – 10.2.241.24	10.2.241.24
26	10.2.241.25/32	10.2.241.25 – 10.2.241.25	10.2.241.25
27	10.2.241.26/32	10.2.241.26 – 10.2.241.26	10.2.241.26
28	10.2.241.27/32	10.2.241.27 – 10.2.241.27	10.2.241.27
29	10.2.241.28/32	10.2.241.28 – 10.2.241.28	10.2.241.28
30	10.2.241.29/32	10.2.241.29 – 10.2.241.29	10.2.241.29
31	10.2.241.30/32	10.2.241.30 – 10.2.241.30	10.2.241.30
32	10.2.241.31/32	10.2.241.31 – 10.2.241.31	10.2.241.31
33	10.2.241.32/32	10.2.241.32 – 10.2.241.32	10.2.241.32
34	10.2.241.33/32	10.2.241.33 – 10.2.241.33	10.2.241.33
35	10.2.241.34/32	10.2.241.34 – 10.2.241.34	10.2.241.34
36	10.2.241.35/32	10.2.241.35 – 10.2.241.35	10.2.241.35
37	10.2.241.36/32	10.2.241.36 – 10.2.241.36	10.2.241.36
38	10.2.241.37/32	10.2.241.37 – 10.2.241.37	10.2.241.37
39	10.2.241.38/32	10.2.241.38 – 10.2.241.38	10.2.241.38
40	10.2.241.39/32	10.2.241.39 – 10.2.241.39	10.2.241.39
41	10.2.241.40/32	10.2.241.40 – 10.2.241.40	10.2.241.40
42	10.2.241.41/32	10.2.241.41 – 10.2.241.41	10.2.241.41
43	10.2.241.42/32	10.2.241.42 – 10.2.241.42	10.2.241.42
44	10.2.241.43/32	10.2.241.43 – 10.2.241.43	10.2.241.43
45	10.2.241.44/32	10.2.241.44 – 10.2.241.44	10.2.241.44
46	10.2.241.45/32	10.2.241.45 – 10.2.241.45	10.2.241.45
47	10.2.241.46/32	10.2.241.46 – 10.2.241.46	10.2.241.46
48	10.2.241.47/32	10.2.241.47 – 10.2.241.47	10.2.241.47
49	10.2.241.48/32	10.2.241.48 – 10.2.241.48	10.2.241.48
50	10.2.241.49/32	10.2.241.49 – 10.2.241.49	10.2.241.49
51	10.2.241.50/32	10.2.241.50 – 10.2.241.50	10.2.241.50
52	10.2.241.51/32	10.2.241.51 – 10.2.241.51	10.2.241.51
53	10.2.241.52/32	10.2.241.52 – 10.2.241.52	10.2.241.52
54	10.2.241.53/32	10.2.241.53 – 10.2.241.53	10.2.241.53
55	10.2.241.54/32	10.2.241.54 – 10.2.241.54	10.2.241.54
56	10.2.241.55/32	10.2.241.55 – 10.2.241.55	10.2.241.55
57	10.2.241.56/32	10.2.241.56 – 10.2.241.56	10.2.241.56
58	10.2.241.57/32	10.2.241.57 – 10.2.241.57	10.2.241.57
59	10.2.241.58/32	10.2.241.58 – 10.2.241.58	10.2.241.58
60	10.2.241.59/32	10.2.241.59 – 10.2.241.59	10.2.241.59
61	10.2.241.60/32	10.2.241.60 – 10.2.241.60	10.2.241.60
62	10.2.241.61/32	10.2.241.61 – 10.2.241.61	10.2.241.61
63	10.2.241.62/32	10.2.241.62 – 10.2.241.62	10.2.241.62
64	10.2.241.63/32	10.2.241.63 – 10.2.241.63	10.2.241.63
65	10.2.241.64/32	10.2.241.64 – 10.2.241.64	10.2.241.64
66	10.2.241.65/32	10.2.241.65 – 10.2.241.65	10.2.241.65
67	10.2.241.66/32	10.2.241.66 – 10.2.241.66	10.2.241.66
68	10.2.241.67/32	10.2.241.67 – 10.2.241.67	10.2.241.67
69	10.2.241.68/32	10.2.241.68 – 10.2.241.68	10.2.241.68
70	10.2.241.69/32	10.2.241.69 – 10.2.241.69	10.2.241.69
71	10.2.241.70/32	10.2.241.70 – 10.2.241.70	10.2.241.70
72	10.2.241.71/32	10.2.241.71 – 10.2.241.71	10.2.241.71
73	10.2.241.72/32	10.2.241.72 – 10.2.241.72	10.2.241.72
74	10.2.241.73/32	10.2.241.73 – 10.2.241.73	10.2.241.73
75	10.2.241.74/32	10.2.241.74 – 10.2.241.74	10.2.241.74
76	10.2.241.75/32	10.2.241.75 – 10.2.241.75	10.2.241.75
77	10.2.241.76/32	10.2.241.76 – 10.2.241.76	10.2.241.76
78	10.2.241.77/32	10.2.241.77 – 10.2.241.77	10.2.241.77
79	10.2.241.78/32	10.2.241.78 – 10.2.241.78	10.2.241.78
80	10.2.241.79/32	10.2.241.79 – 10.2.241.79	10.2.241.79
81	10.2.241.80/32	10.2.241.80 – 10.2.241.80	10.2.241.80
82	10.2.241.81/32	10.2.241.81 – 10.2.241.81	10.2.241.81
83	10.2.241.82/32	10.2.241.82 – 10.2.241.82	10.2.241.82
84	10.2.241.83/32	10.2.241.83 – 10.2.241.83	10.2.241.83
85	10.2.241.84/32	10.2.241.84 – 10.2.241.84	10.2.241.84
86	10.2.241.85/32	10.2.241.85 – 10.2.241.85	10.2.241.85
87	10.2.241.86/32	10.2.241.86 – 10.2.241.86	10.2.241.86
88	10.2.241.87/32	10.2.241.87 – 10.2.241.87	10.2.241.87
89	10.2.241.88/32	10.2.241.88 – 10.2.241.88	10.2.241.88
90	10.2.241.89/32	10.2.241.89 – 10.2.241.89	10.2.241.89
91	10.2.241.90/32	10.2.241.90 – 10.2.241.90	10.2.241.90
92	10.2.241.91/32	10.2.241.91 – 10.2.241.91	10.2.241.91
93	10.2.241.92/32	10.2.241.92 – 10.2.241.92	10.2.241.92
94	10.2.241.93/32	10.2.241.93 – 10.2.241.93	10.2.241.93
95	10.2.241.94/32	10.2.241.94 – 10.2.241.94	10.2.241.94
96	10.2.241.95/32	10.2.241.95 – 10.2.241.95	10.2.241.95
97	10.2.241.96/32	10.2.241.96 – 10.2.241.96	10.2.241.96
98	10.2.241.97/32	10.2.241.97 – 10.2.241.97	10.2.241.97
99	10.2.241.98/32	10.2.241.98 – 10.2.241.98	10.2.241.98
100	10.2.241.99/32	10.2.241.99 – 10.2.241.99	10.2.241.99
101	10.2.241.100/32	10.2.241.100 – 10.2.241.100	10.2.241.100
102	10.2.241.101/32	10.2.241.101 – 10.2.241.101	10.2.241.101
103	10.2.241.102/32	10.2.241.102 – 10.2.241.102	10.2.241.102
104	10.2.241.103/32	10.2.241.103 – 10.2.241.103	10.2.241.103
105	10.2.241.104/32	10.2.241.104 – 10.2.241.104	10.2.241.104
106	10.2.241.105/32	10.2.241.105 – 10.2.241.105	10.2.241.105
107	10.2.241.106/32	10.2.241.106 – 10.2.241.106	10.2.241.106
108	10.2.241.107/32	10.2.241.107 – 10.2.241.107	10.2.241.107
109	10.2.241.108/32	10.2.241.108 – 10.2.241.108	10.2.241.108
110	10.2.241.109/32	10.2.241.109 – 10.2.241.109	10.2.241.109
111	10.2.241.110/32	10.2.241.110 – 10.2.241.110	10.2.241.110
112	10.2.241.111/32	10.2.241.111 – 10.2.241.111	10.2.241.111
113	10.2.241.112/32	10.2.241.112 – 10.2.241.112	10.2.241.112
114	10.2.241.113/32	10.2.241.113 – 10.2.241.113	10.2.241.113
115	10.2.241.114/32	10.2.241.114 – 10.2.241.114	10.2.241.114
116	10.2.241.115/32	10.2.241.115 – 10.2.241.115	10.2.241.115
117	10.2.241.116/32	10.2.241.116 – 10.2.241.116	10.2.241.116
118	10.2.241.117/32	10.2.241.117 – 10.2.241.117	10.2.241.117
119	10.2.241.118/32	10.2.241.118 – 10.2.241.118	10.2.241.118
120	10.2.241.119/32	10.2.241.119 – 10.2.241.119	10.2.241.119
121	10.2.241.120/32	10.2.241.120 – 10.2.241.120	10.2.241.120
122	10.2.241.121/32	10.2.241.121 – 10.2.241.121	10.2.241.121
123	10.2.241.122/32	10.2.241.122 – 10.2.241.122	10.2.241.122
124	10.2.241.123/32	10.2.241.123 – 10.2.241.123	10.2.241.123
125	10.2.241.124/32	10.2.241.124 – 10.2.241.124	10.2.241.124
126	10.2.241.125/32	10.2.241.125 – 10.2.241.125	10.2.241.125
127	10.2.241.126/32	10.2.241.126 – 10.2.241.126	10.2.241.126
128	10.2.241.127/32	10.2.241.127 – 10.2.241.127	10.2.241.127

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 →