Here is a list of the 100 oldest domains currently registered.
15-Mar-1985 SYMBOLICS.COM
24-Apr-1985 BBN.COM
24-May-1985 THINK.COM
11-Jul-1985 MCC.COM
30-Sep-1985 DEC.COM
07-Nov-1985 NORTHROP.COM
09-Jan-1986 XEROX.COM
17-Jan-1986 SRI.COM
03-Mar-1986 HP.COM
05-Mar-1986 BELLCORE.COM
19-Mar-1986 IBM.COM
19-Mar-1986 SUN.COM
25-Mar-1986 INTEL.COM
25-Mar-1986 TI.COM
25-Apr-1986 ATT.COM
08-May-1986 GMR.COM
08-May-1986 TEK.COM
10-Jul-1986 FMC.COM
10-Jul-1986 UB.COM
05-Aug-1986 BELL-ATL.COM
05-Aug-1986 GE.COM
05-Aug-1986 GREBYN.COM
05-Aug-1986 ISC.COM
05-Aug-1986 NSC.COM
05-Aug-1986 STARGATE.COM
02-Sep-1986 BOEING.COM
18-Sep-1986 ITCORP.COM
29-Sep-1986 SIEMENS.COM
18-Oct-1986 PYRAMID.COM
27-Oct-1986 ALPHACDC.COM
27-Oct-1986 BDM.COM
27-Oct-1986 FLUKE.COM
27-Oct-1986 INMET.COM
27-Oct-1986 KESMAI.COM
27-Oct-1986 MENTOR.COM
27-Oct-1986 NEC.COM
27-Oct-1986 RAY.COM
27-Oct-1986 ROSEMOUNT.COM
27-Oct-1986 VORTEX.COM
05-Nov-1986 ALCOA.COM
05-Nov-1986 GTE.COM
17-Nov-1986 ADOBE.COM
17-Nov-1986 AMD.COM
17-Nov-1986 DAS.COM
17-Nov-1986 DATA-IO.COM
17-Nov-1986 OCTOPUS.COM
17-Nov-1986 PORTAL.COM
17-Nov-1986 TELTONE.COM
11-Dec-1986 3COM.COM
11-Dec-1986 AMDAHL.COM
11-Dec-1986 CCUR.COM
11-Dec-1986 CI.COM
11-Dec-1986 CONVERGENT.COM
11-Dec-1986 DG.COM
11-Dec-1986 PEREGRINE.COM
11-Dec-1986 QUAD.COM
11-Dec-1986 SQ.COM
11-Dec-1986 TANDY.COM
11-Dec-1986 TTI.COM
11-Dec-1986 UNISYS.COM
19-Jan-1987 CGI.COM
19-Jan-1987 CTS.COM
19-Jan-1987 SPDCC.COM
19-Feb-1987 APPLE.COM
04-Mar-1987 NMA.COM
04-Mar-1987 PRIME.COM
04-Apr-1987 PHILIPS.COM
23-Apr-1987 DATACUBE.COM
23-Apr-1987 KAI.COM
23-Apr-1987 TIC.COM
23-Apr-1987 VINE.COM
30-Apr-1987 NCR.COM
14-May-1987 CISCO.COM
14-May-1987 RDL.COM
20-May-1987 SLB.COM
27-May-1987 PARCPLACE.COM
27-May-1987 UTC.COM
26-Jun-1987 IDE.COM
09-Jul-1987 TRW.COM
13-Jul-1987 UNIPRESS.COM
27-Jul-1987 DUPONT.COM
27-Jul-1987 LOCKHEED.COM
28-Jul-1987 ROSETTA.COM
18-Aug-1987 TOAD.COM
31-Aug-1987 QUICK.COM
03-Sep-1987 ALLIED.COM
03-Sep-1987 DSC.COM
03-Sep-1987 SCO.COM
22-Sep-1987 GENE.COM
22-Sep-1987 KCCS.COM
22-Sep-1987 SPECTRA.COM
22-Sep-1987 WLK.COM
30-Sep-1987 MENTAT.COM
14-Oct-1987 WYSE.COM
02-Nov-1987 CFG.COM
09-Nov-1987 MARBLE.COM
16-Nov-1987 CAYMAN.COM
16-Nov-1987 ENTITY.COM
24-Nov-1987 KSR.COM
30-Nov-1987 NYNEXST.COM