https://github.com/vim/vim/pull/7351
https://github.com/sebastianw/vim-bindzone/blob/master/syntax/bindzone.vim

Index: runtime/syntax/bindzone.vim
--- runtime/syntax/bindzone.vim.orig
+++ runtime/syntax/bindzone.vim
@@ -11,13 +11,16 @@
 
-" quit when a syntax file was already loaded
-if exists("b:current_syntax")
+" For version 5.x: Clear all syntax items
+" For version 6.x: Quit when a syntax file was already loaded
+if version < 600
+  syntax clear
+elseif exists("b:current_syntax")
   finish
 endif
 
 syn case match
 
 " Directives
-syn region      zoneRRecord     start=/^/ end=/$/ contains=zoneOwnerName,zoneSpecial,zoneTTL,zoneClass,zoneRRType,zoneComment,zoneUnknown
+syn region      zoneRRecord     start=/^/ end=/$/ contains=zoneOwnerName,zoneSpecial,zoneTTL,zoneClass,zoneRRType,zoneRRHashType,zoneComment,zoneUnknown
 
 syn match       zoneDirective   /^\$ORIGIN\s\+/   nextgroup=zoneOrigin,zoneUnknown
 syn match       zoneDirective   /^\$TTL\s\+/      nextgroup=zoneTTL,zoneUnknown
@@ -26,15 +29,19 @@ syn match       zoneDirective   /^\$GENERATE\s/
 
 syn match       zoneUnknown     contained /\S\+/
 
-syn match       zoneOwnerName   contained /^[^[:space:]!"#$%&'()*+,\/:;<=>?@[\]\^`{|}~]\+\(\s\|;\)\@=/ nextgroup=zoneTTL,zoneClass,zoneRRType skipwhite
+syn match       zoneOwnerName   contained /^[^[:space:]!"#$%&'()*+,\/:;<=>?@[\]\^`{|}~]\+\(\s\|;\)\@=/ nextgroup=zoneTTL,zoneClass,zoneRRType,zoneRRHashType skipwhite
 syn match       zoneOrigin      contained  /[^[:space:]!"#$%&'()*+,\/:;<=>?@[\]\^`{|}~]\+\(\s\|;\|$\)\@=/
 syn match       zoneDomain      contained  /[^[:space:]!"#$%&'()*+,\/:;<=>?@[\]\^`{|}~]\+\(\s\|;\|$\)\@=/
 
 syn match       zoneSpecial     contained /^[@*.]\s/
-syn match       zoneTTL         contained /\s\@<=\d[0-9WwDdHhMmSs]*\(\s\|$\)\@=/ nextgroup=zoneClass,zoneRRType skipwhite
-syn keyword     zoneClass       contained IN CHAOS CH HS HESIOD nextgroup=zoneRRType,zoneTTL skipwhite
-syn keyword     zoneRRType      contained A AAAA CERT CNAME DNAME DNSKEY DS HINFO LOC MX NAPTR NS NSEC NSEC3 NSEC3PARAM PTR RP RRSIG SSHFP SOA SPF SRV TLSA TXT nextgroup=zoneRData skipwhite
+syn match       zoneOwnerName   contained /^\*\.[^[:space:]!"#$%&'()*+,\/:;<=>?@[\]\^`{|}~]\+\(\s\|;\)\@=/ nextgroup=zoneTTL,zoneClass,zoneRRType,zoneRRHashType skipwhite
+syn match       zoneTTL         contained /\s\@<=\d[0-9WwDdHhMmSs]*\(\s\|$\)\@=/ nextgroup=zoneClass,zoneRRType,zoneRRHashType skipwhite
+syn keyword     zoneClass       contained IN CHAOS nextgroup=zoneRRType,zoneRRHashType,zoneTTL skipwhite
+syn keyword     zoneRRType      contained A AAAA A6 CAA CERT CNAME DNAME HINFO LOC MX NAPTR NS NSEC NSEC3 NSEC3PARAM PTR RRSIG SOA SPF SRV TXT nextgroup=zoneRData skipwhite
+syn keyword     zoneRRHashType  contained CERT DNSKEY DS IPSECKEY SSHFP TLSA nextgroup=zoneRHashData skipwhite
 syn match       zoneRData       contained /[^;]*/ contains=zoneDomain,zoneIPAddr,zoneIP6Addr,zoneText,zoneNumber,zoneParen,zoneUnknown
+syn match       zoneRHashData   contained /[^;]*/ contains=zoneHash,zoneUnknown
+syn match       zoneHash        contained /\S\+/
 
 syn match       zoneIPAddr      contained /\<[0-9]\{1,3}\(\.[0-9]\{1,3}\)\{,3}\>/
 
@@ -67,30 +74,42 @@ syn region      zoneParen       contained start="(" en
 syn match       zoneComment     /;.*/
 
 " Define the default highlighting.
-" Only when an item doesn't have highlighting yet
+" For version 5.7 and earlier: only when not done already
+" For version 5.8 and later: only when an item doesn't have highlighting yet
+if version >= 508 || !exists("did_bind_zone_syn_inits")
+  if version < 508
+    let did_bind_zone_syn_inits = 1
+    command -nargs=+ HiLink hi link <args>
+  else
+    command -nargs=+ HiLink hi def link <args>
+  endif
 
-hi def link zoneDirective    Macro
+  HiLink zoneDirective    Macro
+  
+  HiLink zoneUnknown      Error
+  
+  HiLink zoneOrigin       Statement
+  HiLink zoneOwnerName    Statement
+  HiLink zoneDomain       Identifier
+  
+  HiLink zoneSpecial      Special
+  HiLink zoneTTL          Constant
+  HiLink zoneClass        Include
+  HiLink zoneHash         String
+  HiLink zoneRRType       Type
+  HiLink zoneRRHashType   Type
+  
+  HiLink zoneIPAddr       Number
+  HiLink zoneIP6Addr      Number
+  HiLink zoneText         String
+  HiLink zoneNumber       Number
+  HiLink zoneSerial       Special
+  
+  HiLink zoneErrParen     Error
+  HiLink zoneComment      Comment
 
-hi def link zoneUnknown      Error
-
-hi def link zoneOrigin       Statement
-hi def link zoneOwnerName    Statement
-hi def link zoneDomain       Identifier
-
-hi def link zoneSpecial      Special
-hi def link zoneTTL          Constant
-hi def link zoneClass        Include
-hi def link zoneRRType       Type
-
-hi def link zoneIPAddr       Number
-hi def link zoneIP6Addr      Number
-hi def link zoneText         String
-hi def link zoneNumber       Number
-hi def link zoneSerial       Special
-
-hi def link zoneErrParen     Error
-hi def link zoneComment      Comment
-
+  delcommand HiLink
+endif
 
 let b:current_syntax = "bindzone"