R0045/2026-03-29/Q002
Query: What was the web server market share in mid-2001, specifically Apache vs commercial alternatives (Microsoft IIS, Netscape/iPlanet, etc.)? What were industry analysts saying about Apache's viability as an enterprise web server at that time? When did Apache become the dominant enterprise web server, and what was the trajectory?
BLUF: Apache held 63% of web server hostnames in June 2001 (18.5M sites), making it already the dominant web server by far. Microsoft IIS had 20.4% (6.0M sites) and Netscape-Enterprise had 6.0%. However, when Netcraft counted physical servers rather than hostnames, IIS led significantly due to Apache's concentration at shared hosting providers. By November 2003, Apache ran two-thirds of all web sites. Apache was already dominant by hostname count well before 2001, having held majority share since 1996.
Answer: H3 (measurement-dependent) · Confidence: High
Summary
| Entity |
Description |
| Query Definition |
Question as received, clarified, ambiguities, sub-questions |
| Assessment |
Full analytical product |
| ACH Matrix |
Evidence × hypotheses diagnosticity analysis |
| Self-Audit |
ROBIS-adapted 4-domain process audit |
Hypotheses
| ID |
Statement |
Status |
| H1 |
Apache already dominant by 2001 with ~63% hostname share |
Supported (by hostname count) |
| H2 |
Apache not yet dominant in enterprise in 2001 |
Partially supported (by physical server count) |
| H3 |
Dominance depends entirely on measurement methodology |
Supported |
June 2001 Netcraft Web Server Survey
| Server |
Hostname Share |
Active Site Share |
| Apache |
63.02% (18.5M) |
62.42% (7.3M) |
| Microsoft IIS |
20.38% (6.0M) |
26.14% (3.1M) |
| Netscape-Enterprise |
6.04% (1.8M) |
— |
| iPlanet |
— |
2.32% (273K) |
| Zeus |
2.76% (810K) |
— |
Physical Server OS Distribution (June 2001)
| OS |
Share |
| Windows |
49.2% |
| Linux |
28.5% |
| Solaris |
7.6% |
| BSD |
6.3% |
Searches
| ID |
Target |
Type |
Outcome |
| S01 |
Web server market share 2001 |
WebSearch |
3 selected, 7 rejected |
| S02 |
Apache 2/3 market share 2003 |
WebSearch |
2 selected, 8 rejected |
Sources
| Source |
Description |
Reliability |
Relevance |
Evidence |
| SRC01 |
Netcraft June 2001 survey (via ApacheToday) |
High |
High |
2 extracts |
| SRC02 |
Netcraft Nov 2003 survey (via Slashdot) |
Medium |
High |
1 extract |
| SRC03 |
The Register analysis of June 2001 data |
High |
High |
1 extract |
Revisit Triggers
- Access to archived Netcraft surveys with full historical data from 1995-2005