The second character in its name was originally a slashed zero, a symbol used by old teletypewriters and some character mode operating systems to mean zero. Its modern online name, including its domain name, is therefore "l0pht" (with a zero), not "lopht" (with an O), or "lØpht" (with a Nordic Ø), the latter of which would not have been a valid domain name at the time of its founding. The original idea for the name was simply "Lopht", but another member of the Boston hacker scene, Majikthys, suggested a 0 replace the o, and the idea was swiftly adopted.
The origin of the name may be traced to the fact that some of the founding members of L0pht shared a common loft apartment in Boston, from where they experimented with their personal computers and equipment purchased from Flea at MIT, and items obtrained from dumpster diving local places of interest.
In January 2000, L0pht Heavy Industries merged with the startup @stake, completing the L0pht's slow transition from an underground organization into a "whitehat" computer security company. Symantec announced its acquisition of @stake on September 16, 2004, and completed the transaction on October 8 of that year.
On March 14, 2008, several members of L0pht sat at a panel at a standing-room-only group of InfoSec professionals at SOURCE:Boston. Present were Weld Pond, John Tan, Mudge, Space Rogue, Silicosis and Dildog.
Occasionally, shell accounts were offered for low cost on the L0pht.com server to select individuals; while these individuals had access to the L0pht.com server they were not members of L0pht. One of the first physical products sold for profit by L0pht was a POCSAG decoder kit, which was sold in both kit and assembled form. Subsequently, the Whacked Mac Archives was transferred to CD-ROM for sale, soon followed by CD copies of the Black Crawling System Archives. The command line version of L0phtCrack, the password cracker for Windows NT, was given away free, but the GUI version was sold as a commercial product. This was followed by the creation of the Hacker News Network website to host advertisements. However, even with these sources of income, L0pht barely broke even, and eventually began doing custom security coding for companies like NFR.