The entry change notification control is a [supportedControl] that is included in search result entries returned to clients in response to a [search operation|SearchRequest] that uses the [Persistent Search Control].  

The entry change notification control is described in [draft-ietf-ldapext-psearch|https://opends.dev.java.net/public/standards/draft-ietf-ldapext-psearch.txt] and has an OID of 2.16.840.1.113730.3.4.7.  

The entry change notification control is defined as follows:

{{{           EntryChangeNotification ::= SEQUENCE {
                     changeType ENUMERATED {
                             add             (1),
                             delete          (2),
                             modify          (4),
                             modDN           (8)
                     },
                     previousDN   LDAPDN OPTIONAL,     -- modifyDN ops. only
                     changeNumber INTEGER OPTIONAL     -- if supported
} }}}

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