IP address 205.139.105.21
IP address: 205.139.105.21
Address type: IPv4
Host or reverse DNS (rDNS): mail.sertoma.org
Country: 
United States
205.139.105.21 does NOT belong to a private IP address block.
205.139.105.21 does NOT belong to a reserved IP address block.
There are different formats or notations how the IP address 205.139.105.21 can be represented.
Dotted decimal: 205.139.105.21
Hexadecimal: 0xCD8B6915
Dotted hex: 0xCD.0x8B.0x69.0x15
Decimal: 3448465685
Octal: 0315.0213.0151.0025
Binary: 11001101.10001011.01101001.00010101