Domain Name System (DNS) was firstly available in 1984. Top level domain was defined in 1985. The first top level domain defined in 1985 : general Top Level Domain (COM, ORG, MIL, EDU, GOV) and country code Top Level Domain (ccTLD).
The first registered .EDU domains were:
- ucla.edu (University of California at Los Angeles)
- purdue.edu (Purdue University)
- cmu.edu (Carnegie Mellon University)
- rice.edu (Rice University)
The first registered .ORG was
- mitre.org (Mitre Corporation)
The first registered .GOV was:
- css.gov (inactive)
The first hundred .COM registered domains were:
- SYMBOLICS.COM
- BBN.COM
- THINK.COM
- MCC.COM
- DEC.COM
- NORTHROP.COM
- XEROX.COM
- SRI.COM
- HP.COM
- BELLCORE.COM
- IBM.COM
- SUN.COM
- INTEL.COM
- TI.COM
- ATT.COM
- GMR.COM
- TEK.COM
- FMC.COM
- UB.COM
- BELL-ATL.COM
- GE.COM
- GREBYN.COM
- ISC.COM
- NSC.COM
- STARGATE.COM
- BOEING.COM
- ITCORP.COM
- SIEMENS.COM
- PYRAMID.COM
- ALPHACDC.COM
- BDM.COM
- FLUKE.COM
- INMET.COM
- KESMAI.COM
- MENTOR.COM
- NEC.COM
- RAY.COM
- ROSEMOUNT.COM
- VORTEX.COM
- ALCOA.COM
- GTE.COM
- ADOBE.COM
- AMD.COM
- DAS.COM
- DATA-IO.COM
- OCTOPUS.COM
- PORTAL.COM
- TELTONE.COM
- 3COM.COM
- AMDAHL.COM
- CCUR.COM
- CI.COM
- CONVERGENT.COM
- DG.COM
- PEREGRINE.COM
- QUAD.COM
- SQ.COM
- TANDY.COM
- TTI.COM
- UNISYS.COM
- CGI.COM
- CTS.COM
- SPDCC.COM
- APPLE.COM
- NMA.COM
- PRIME.COM
- PHILIPS.COM
- DATACUBE.C
- KAI.COM
- TIC.COM
- VINE.COM
- NCR.COM
- CISCO.COM
- RDL.COM
- SLB.COM
- PARCPLACE.COM
- UTC.COM
- IDE.COM
- TRW.COM
- UNIPRESS.COM
- DUPONT.COM
- LOCKHEED.COM
- ROSETTA.COM
- TOAD.COM
- QUICK.COM
- ALLIED.COM
- DSC.COM
- SCO.COM
- GENE.COM
- KCCS.COM
- SPECTRA.COM
- WLK.COM
- MENTAT.COM
- WYSE.COM
- CFG.COM
- MARBLE.COM
- CAYMAN.COM
- ENTITY.COM
- KSR.COM
- NYNEXST.COM
