This file is indexed.

/etc/slp.reg is in slpd 1.2.1-10+deb8u1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#############################################################################
#
# OpenSLP registration file
#
# May be used to register services for legacy applications that do not use
# the SLPAPIs to register for themselves
#
# Format and contents conform to specification in IETF RFC 2614 so the
# comments use the language of the RFC.  In OpenSLP, SLPD operates as an SA
# and a DA.  The SLP UA functionality is encapsulated by the libslp library.
#
#############################################################################

#comment
;comment 
#service-url,language-tag,lifetime,[service-type]<newline> 
#["scopes="scope-list<newline>]
#[attrid"="val1<newline>] 
#[attrid"="val1,val2,val3<newline>] 
#<newline>

#
# The following are examples entries for this file
#

##Register a OpenSLP testing service 
#service:test.openslp://192.168.100.1,en,65535 
#scopes=test1,test2 
#description=OpenSLP Testing Service 
#authors=mpeterson,jcarey 

##Register ssh service 
#service:ssh.openslp://192.168.100.1,en,65535 
#use default scopes 
#description="Secure Shell" 

##Register telnet service with no attributes 
#service:telnet.myorg://192.168.100.1,en,65535 
#use default scopes