$ corelist Module::CoreList

Module::CoreList was first released with perl v5.8.9
$ corelist -V 5.004

The following modules were in perl 5.004 CORE
AnyDBM_File            
AutoLoader             
AutoSplit              
Benchmark              
Bundle::CPAN           0.02
CGI                    2.36
CGI::Apache            1.01
CGI::Carp              1.06
CGI::Fast              1.00a
CGI::Push              1.00
CGI::Switch            0.05
CPAN                   1.2401
CPAN::FirstTime        1.18 
CPAN::Nox              
Carp                   
Class::Struct          
Config                 
Cwd                    2.00
DB_File                1.14
Devel::SelfStubber     1.01
DirHandle              
DynaLoader             1.02
English                
Env                    
Exporter               
ExtUtils::Command      1.00
ExtUtils::Embed        1.2501
ExtUtils::Install      1.16 
ExtUtils::Liblist      1.2201 
ExtUtils::MM_OS2       
ExtUtils::MM_Unix      1.114 
ExtUtils::MM_VMS       
ExtUtils::MM_Win32     
ExtUtils::MakeMaker    5.4002
ExtUtils::Manifest     1.33 
ExtUtils::Mkbootstrap  1.13 
ExtUtils::Mksymlists   1.13 
ExtUtils::XSSymSet     1.0
ExtUtils::testlib      1.11 
Fcntl                  1.03
File::Basename         2.5
File::CheckTree        
File::Compare          1.1001
File::Copy             2.02
File::Find             
File::Path             1.04
File::stat             
FileCache              
FileHandle             2.00
FindBin                1.04
GDBM_File              1.00
Getopt::Long           2.10
Getopt::Std            
I18N::Collate          
IO                     
IO::File               1.0602
IO::Handle             1.1504
IO::Pipe               1.0901
IO::Seekable           1.06
IO::Select             1.10
IO::Socket             1.1602
IPC::Open2             1.01
IPC::Open3             1.0101
Math::BigFloat         
Math::BigInt           
Math::Complex          1.01
Math::Trig             1
NDBM_File              1.00
Net::Ping              2.02
Net::hostent           
Net::netent            
Net::protoent          
Net::servent           
ODBM_File              1.00
OS2::ExtAttr           0.01
OS2::PrfDB             0.02
OS2::Process           
OS2::REXX              
Opcode                 1.04
POSIX                  1.02
Pod::Functions         
Pod::Html              
Pod::Text              1.0203
SDBM_File              1.00
Safe                   2.06
Search::Dict           
SelectSaver            
SelfLoader             1.07
Shell                  
Socket                 1.6
Symbol                 1.02
Sys::Hostname          
Sys::Syslog            
Term::Cap              
Term::Complete         
Term::ReadLine         
Test::Harness          1.1502
Text::Abbrev           
Text::ParseWords       
Text::Soundex          
Text::Tabs             96.121201
Text::Wrap             97.011701
Tie::Hash              
Tie::RefHash           
Tie::Scalar            
Tie::SubstrHash        
Time::Local            
Time::gmtime           1.01
Time::localtime        1.01
Time::tm               
UNIVERSAL              
User::grent            
User::pwent            
VMS::DCLsym            1.01
VMS::Filespec          
VMS::Stdio             2.02
autouse                1.01
blib                   
constant               1.00
diagnostics            
integer                
less                   
lib                    
locale                 
ops                    
overload               
sigtrap                1.02
strict                 
subs                   
vars                   
vmsish