| Date | Host Count | Replied | |
|---|---|---|---|
| Survey | Adjusted | To Ping* | |
| [* estimated by pinging 1% of all hosts] | |||
| [** New survey methodology] | |||
| Jan 98 ** | 29,670,000 | 5,331,640 | |
| Jul 97 | 19,540,000 | 26,053,000 | 4,314,410 |
| Jan 97 | 16,146,000 | 21,819,000 | 3,392,000 |
| Jul 96 | 12,881,000 | 16,729,000 | 2,569,000 |
| Jan 96 | 9,472,000 | 14,352,000 | 1,682,000 |
| Jul 95 | 6,642,000 | 8,200,000 | 1,149,000 |
| Jan 95 | 4,852,000 | 5,846,000 | 970,000 |