The IP address 18.81.231 is provided by Massachusetts Institute of Technology, it's belong to the CDIR (Classless Inter-Domain Routing) 18.0.0.0/8 (range 18.0.0.0 to 18.255.255.255). The autonomous system number (ASN) is 3.
| ASN | 3 |
| IP starting by | 18.0.0.0 |
| IP ending by | 18.255.255.255 |
| ASN Name | Massachusetts Institute of Technology |
| CDIR | 18.0.0.0/8 |
| Numerical IP | |
| Registry | |
| Last update | 29/10/2017 |

| Country Code | Country | Region | City | Latitude | Longitude | Last update | |
| IP2Location | US | United States | - | Cambridge | 42.3651 | -71.1045 | 2017-10-29 |
| MaxMind | US | United States | - | Cambridge | 42.3646 | -71.1028 | 2017-10-29 |
| Whois | US | - | - | - | -96 | 37 | |
| W3C | - | - | - | - | - | - | - |