diff --git a/modules/api/src/main/scala/vinyldns/api/domain/DomainValidations.scala b/modules/api/src/main/scala/vinyldns/api/domain/DomainValidations.scala
index 0170d13f6..e78637e0f 100644
--- a/modules/api/src/main/scala/vinyldns/api/domain/DomainValidations.scala
+++ b/modules/api/src/main/scala/vinyldns/api/domain/DomainValidations.scala
@@ -163,4 +163,8 @@ object DomainValidations {
   def validateMX_NAPTR_SRVData(number: Int, recordDataType: String, recordType: String): ValidatedNel[DomainValidationError, Int] =
     if (number >= INTEGER_MIN_VALUE && number <= INTEGER_MAX_VALUE) number.validNel
     else InvalidMX_NAPTR_SRVData(number, INTEGER_MIN_VALUE, INTEGER_MAX_VALUE, recordDataType, recordType).invalidNel[Int]
+
+  def validateNaptrFlag(value: String): ValidatedNel[DomainValidationError, String] =
+    if (value == "U" || value == "S" || value == "A" || value == "P") value.validNel
+    else InvalidNaptrFlag(value).invalidNel[String]
 }
diff --git a/modules/api/src/main/scala/vinyldns/api/domain/batch/BatchChangeValidations.scala b/modules/api/src/main/scala/vinyldns/api/domain/batch/BatchChangeValidations.scala
index fa2e57226..353e59b34 100644
--- a/modules/api/src/main/scala/vinyldns/api/domain/batch/BatchChangeValidations.scala
+++ b/modules/api/src/main/scala/vinyldns/api/domain/batch/BatchChangeValidations.scala
@@ -248,7 +248,7 @@ class BatchChangeValidations(
       case mx: MXData =>
         validateMX_NAPTR_SRVData(mx.preference, "preference", "MX").asUnit |+| validateHostName(mx.exchange).asUnit
       case ns: NSData => validateHostName(ns.nsdname).asUnit
-      case naptr: NAPTRData => validateMX_NAPTR_SRVData(naptr.preference, "preference", "NAPTR").asUnit |+| validateMX_NAPTR_SRVData(naptr.order, "order", "NAPTR").asUnit |+| validateHostName(naptr.replacement).asUnit
+      case naptr: NAPTRData => validateMX_NAPTR_SRVData(naptr.preference, "preference", "NAPTR").asUnit |+| validateMX_NAPTR_SRVData(naptr.order, "order", "NAPTR").asUnit |+| validateHostName(naptr.replacement).asUnit |+| validateNaptrFlag(naptr.flags).asUnit
       case srv: SRVData => validateMX_NAPTR_SRVData(srv.priority, "priority", "SRV").asUnit |+| validateMX_NAPTR_SRVData(srv.port, "port", "SRV").asUnit |+| validateMX_NAPTR_SRVData(srv.weight, "weight", "SRV").asUnit |+| validateHostName(srv.target).asUnit
       case other =>
         InvalidBatchRecordType(other.toString, SupportedBatchChangeRecordTypes.get).invalidNel[Unit]
diff --git a/modules/core/src/main/scala/vinyldns/core/domain/DomainValidationErrors.scala b/modules/core/src/main/scala/vinyldns/core/domain/DomainValidationErrors.scala
index 7eebf540e..b5973c78f 100644
--- a/modules/core/src/main/scala/vinyldns/core/domain/DomainValidationErrors.scala
+++ b/modules/core/src/main/scala/vinyldns/core/domain/DomainValidationErrors.scala
@@ -113,6 +113,12 @@ final case class InvalidMX_NAPTR_SRVData(param: Long, min: Long, max: Long, reco
     s"""Invalid $recordType $recordDataType: "${param.toString}", must be a number between $min and $max."""
 }
 
+final case class InvalidNaptrFlag(value: String)
+  extends DomainValidationError {
+  def message: String =
+    s"""Invalid NAPTR flag value: '$value'. Valid NAPTR flag value must be U, S, A or P."""
+}
+
 final case class InvalidBatchRecordType(param: String, supported: Set[RecordType])
     extends DomainValidationError {
   def message: String =
diff --git a/modules/core/src/main/scala/vinyldns/core/domain/SingleChangeError.scala b/modules/core/src/main/scala/vinyldns/core/domain/SingleChangeError.scala
index 8324978a0..23d8a2f46 100644
--- a/modules/core/src/main/scala/vinyldns/core/domain/SingleChangeError.scala
+++ b/modules/core/src/main/scala/vinyldns/core/domain/SingleChangeError.scala
@@ -31,7 +31,7 @@ object DomainValidationErrorType extends Enumeration {
   // NOTE: once defined, an error code type cannot be changed!
   val ChangeLimitExceeded, BatchChangeIsEmpty, GroupDoesNotExist, NotAMemberOfOwnerGroup,
   InvalidDomainName, InvalidCname, InvalidLength, InvalidEmail, InvalidRecordType, InvalidPortNumber,
-  InvalidIpv4Address, InvalidIpv6Address, InvalidIPAddress, InvalidTTL, InvalidMX_NAPTR_SRVData,
+  InvalidIpv4Address, InvalidIpv6Address, InvalidIPAddress, InvalidTTL, InvalidMX_NAPTR_SRVData, InvalidNaptrFlag,
   InvalidBatchRecordType, ZoneDiscoveryError, RecordAlreadyExists, RecordDoesNotExist, InvalidUpdateRequest,
   CnameIsNotUniqueError, UserIsNotAuthorized, UserIsNotAuthorizedError, RecordNameNotUniqueInBatch,
   RecordInReverseZoneError, HighValueDomainError, MissingOwnerGroupId, ExistingMultiRecordError,
@@ -56,6 +56,7 @@ object DomainValidationErrorType extends Enumeration {
       case _: InvalidIPAddress => InvalidIPAddress
       case _: InvalidTTL => InvalidTTL
       case _: InvalidMX_NAPTR_SRVData => InvalidMX_NAPTR_SRVData
+      case _: InvalidNaptrFlag => InvalidNaptrFlag
       case _: InvalidBatchRecordType => InvalidBatchRecordType
       case _: ZoneDiscoveryError => ZoneDiscoveryError
       case _: RecordAlreadyExists => RecordAlreadyExists
diff --git a/modules/portal/app/views/dnsChanges/dnsChangeNew.scala.html b/modules/portal/app/views/dnsChanges/dnsChangeNew.scala.html
index ed27608fe..14689e3e3 100644
--- a/modules/portal/app/views/dnsChanges/dnsChangeNew.scala.html
+++ b/modules/portal/app/views/dnsChanges/dnsChangeNew.scala.html
@@ -281,7 +281,7 @@
                                         <br />
 
                                         <label class="batch-label">Flags</label>
-                                        <input name="record_naptr_flags_{{$index}}" type="text" ng-model="change.record.flags" ng-required="change.changeType=='Add'" class="form-control" placeholder="e.g. U, S, A or P">
+                                        <select name="record_naptr_flags_{{$index}}" type="text" ng-model="change.record.flags" ng-required="change.changeType=='Add'" ng-options="flag for flag in naptrFlags" class="form-control" placeholder="e.g. U, S, A or P"></select>
                                         <p ng-show="createBatchChangeForm.$submitted">
                                             <span ng-show="createBatchChangeForm.record_naptr_flags_{{$index}}.$error.required" class="batch-change-error-help">Flags is required!</span>
                                         </p>
diff --git a/modules/portal/public/lib/dns-change/dns-change-new.controller.js b/modules/portal/public/lib/dns-change/dns-change-new.controller.js
index 10cc525e0..9969423be 100644
--- a/modules/portal/public/lib/dns-change/dns-change-new.controller.js
+++ b/modules/portal/public/lib/dns-change/dns-change-new.controller.js
@@ -42,6 +42,7 @@
             $scope.allowManualReview = false;
             $scope.confirmationPrompt = "Are you sure you want to submit this batch change request?";
             $scope.manualReviewEnabled;
+            $scope.naptrFlags = ["U", "S", "A", "P"];
 
             $scope.addSingleChange = function() {
                 $scope.newBatch.changes.push({changeType: "Add", type: "A+PTR"});