Disappearing domains

Sorting out some old website bookmarks on my home PC, I found a few construction IT and e-business ones dating back, in some cases, to 2000 (ie: before the dot.com bubble burst in 2001). Since then, numerous businesses have merged, rebranded or simply disappeared; for example:

• Architec.net – “page cannot be displayed”
• Bidcom – merged into Citadon, which merged into CTSpace
• BuildOnline – merged into CTSpace
• BuildPoint.com – clicks through to isqft.com (offers Internet Plan Room services)
• Buildingwork.com – domain for sale
• Citadon – see Bidcom above
• Clicksure.com – domain for sale
• Construction-uk.com – iCorporation website holding page says offices badly damaged by fire and websites unavailable until further notice
• e-businessreview.co.uk – “page cannot be displayed”
• E-construct – Clicks through to firstM.co.uk, a former website design business
• iScraper – Nothing. (iScraper went bust in 2001. BIW took UK business; BuildOnline took over iScraper’s mainland Europe projects)
• UKonlineforbusiness.gov.uk – “page cannot be displayed”