diff --git a/src/utils/common/exec.c b/src/utils/common/exec.c
index 595c8c8d68fcd3003c9249eccbf8bdde858a1ede..edc1ea52d3730fffa95eb7ca4a0e7bb62aa723b0 100644
--- a/src/utils/common/exec.c
+++ b/src/utils/common/exec.c
@@ -22,7 +22,7 @@
 
 #include <arpa/inet.h>			// inet_ntop
 #include <sys/socket.h>                 // AF_INET
- #include <netinet/in.h>
+#include <netinet/in.h>			// sockaddr_in (BSD)
 
 #include "common/lists.h"		// list
 #include "common/errcode.h"		// KNOT_EOK
@@ -31,10 +31,9 @@
 #include "libknot/packet/query.h"	// knot_query_init
 
 #include "utils/common/msg.h"		// WARN
-#include "utils/common/resolv.h"	// server_t
 #include "utils/common/params.h"	// params_t
 #include "utils/common/netio.h"		// send_msg
-#include "utils/common/rr-serialize.h"
+#include "utils/common/rr-serialize.h"	// rrset_write_mem
 
 static knot_packet_t* create_query_packet(const params_t *params,
                                           const query_t  *query,
@@ -193,7 +192,7 @@ static knot_lookup_table_t rtypes[] = {
 
 static void print_header(const knot_packet_t *packet)
 {
-	char    flags[64] = {0};
+	char    flags[64] = "";
 	uint8_t rcode_id, opcode_id;
 	knot_lookup_table_t *rcode, *opcode;
 
diff --git a/src/utils/common/netio.c b/src/utils/common/netio.c
index a07efe069bb8d33df2ac9e0da79000596a0eac4f..79d3acba4e03f1f1ed971e7b0bed0fff56af85bf 100644
--- a/src/utils/common/netio.c
+++ b/src/utils/common/netio.c
@@ -16,17 +16,42 @@
 
 #include "utils/common/netio.h"
 
-//#include <stdlib.h>
+#include <stdlib.h>			// free
 #include <netdb.h>			// addrinfo
 #include <poll.h>			// poll
-#include <sys/socket.h>			// AF_INET (BSD)                        
-#include <netinet/in.h>			// ntohl (BSD)
 #include <fcntl.h>			// fcntl
+#include <sys/socket.h>			// AF_INET (BSD)
+#include <netinet/in.h>			// ntohl (BSD)
 
 #include "utils/common/msg.h"		// WARN
 #include "libknot/util/descriptor.h"	// KNOT_CLASS_IN
 #include "common/errcode.h"		// KNOT_E
 
+server_t* server_create(const char *name, const char *service)
+{
+	// Create output structure.
+	server_t *server = calloc(1, sizeof(server_t));
+
+	// Check output.
+	if (server == NULL) {
+		return NULL;
+	}
+
+	// Fill output.
+	server->name = strdup(name);
+	server->service = strdup(service);
+
+	// Return result.
+	return server;
+}
+
+void server_free(server_t *server)
+{
+	free(server->name);
+	free(server->service);
+	free(server);
+}
+
 int get_socktype(const params_t *params, const uint16_t type)
 {
 	if (params == NULL) {
@@ -197,7 +222,7 @@ int receive_msg(const params_t *params,
 
 			total += ret;
 		}
-		
+
 		return total;
 	} else {
 		// Wait for datagram data.
diff --git a/src/utils/common/netio.h b/src/utils/common/netio.h
index 9839efa27ab8622b317671ca889c868acbdf3139..19f7ffa14f2787b94152feedbcd558ecfd153af1 100644
--- a/src/utils/common/netio.h
+++ b/src/utils/common/netio.h
@@ -27,10 +27,24 @@
 #ifndef _UTILS__NETIO_H_
 #define _UTILS__NETIO_H_
 
-#include <stdint.h>			// uint16_t
+#include <stdint.h>			// uint_t
 
+#include "common/lists.h"		// node
 #include "utils/common/params.h"	// params_t
-#include "utils/common/resolv.h"	// server_t
+
+/*! \brief Structure containing server information. */
+typedef struct {
+	/*!< List node (for list container). */
+	node	n;
+	/*!< Name or address of the server. */
+	char	*name;
+	/*!< Name or number of the service. */
+	char	*service;
+} server_t;
+
+server_t* server_create(const char *name, const char *service);
+
+void server_free(server_t *server);
 
 int get_socktype(const params_t *params, const uint16_t type);
 
diff --git a/src/utils/common/params.c b/src/utils/common/params.c
index bc6b3e5543c8645d07b020fe1c831c3c6f5889f8..cb0eb5f50ed5bebdf83b5657415016abf850c3aa 100644
--- a/src/utils/common/params.c
+++ b/src/utils/common/params.c
@@ -18,13 +18,12 @@
 
 #include <stdlib.h>			// free
 #include <netinet/in.h>                 // in_addr
-#include <arpa/inet.h>
-#include <sys/socket.h>
+#include <arpa/inet.h>			// inet_pton
+#include <sys/socket.h>			// AF_INET (BSD)
 
 #include "common/errcode.h"		// KNOT_EOK
 #include "libknot/util/descriptor.h"	// KNOT_RRTYPE
 #include "utils/common/msg.h"		// WARN
-#include "utils/common/netio.h"
 
 #define IPV4_REVERSE_DOMAIN	"in-addr.arpa."
 #define IPV6_REVERSE_DOMAIN	"ip6.arpa."
diff --git a/src/utils/common/params.h b/src/utils/common/params.h
index b5076db3071be2594e728a568b035ff6a0beae5c..2fc0dc754bf9d04469a16a3292f40dd99d4efecb 100644
--- a/src/utils/common/params.h
+++ b/src/utils/common/params.h
@@ -32,11 +32,15 @@
 
 #include "common/lists.h"		// node
 
-#define DEFAULT_PORT            53
-#define DEFAULT_UDP_SIZE        512
-#define MAX_PACKET_SIZE         65535
+#define DEFAULT_IPV4_NAME	"127.0.0.1"
+#define DEFAULT_IPV6_NAME	"::1"
+#define DEFAULT_DNS_PORT	"53"
+#define DEFAULT_UDP_SIZE	512
+#define MAX_PACKET_SIZE		65535
 #define DEFAULT_WAIT_INTERVAL	1
 
+#define SEP_CHARS		"\n\t "
+
 /*! \brief Structure containing basic parameters for DNS query. */
 typedef struct {
 	/*!< List node (for list container). */
diff --git a/src/utils/common/resolv.c b/src/utils/common/resolv.c
index 49fb01c119ff1a538ba8f7aa592249f62bce5cfb..46dd4508694bab94c1cc2dff32da7752589edc83 100644
--- a/src/utils/common/resolv.c
+++ b/src/utils/common/resolv.c
@@ -19,28 +19,11 @@
 #include <stdio.h>			// fopen
 #include <stdlib.h>			// free
 
-#include "common/errcode.h"		// KNOT_ENOENT
 #include "common/lists.h"		// list
+#include "common/errcode.h"             // KNOT_ENOENT
+#include "utils/common/params.h"	// DEFAULT_DNS_PORT
 
-#define RESOLV_FILE             "/etc/resolv.conf"
-
-server_t* server_create(const char *name, const char *service)
-{
-	// Create output structure.
-	server_t *server = calloc(1, sizeof(server_t));
-
-	// Check output.
-	if (server == NULL) {
-		return NULL;
-	}
-
-	// Fill output.
-	server->name = strdup(name);
-	server->service = strdup(service);
-
-	// Return result.
-	return server;
-}
+#define RESOLV_FILE	"/etc/resolv.conf"
 
 server_t* parse_nameserver(const char *nameserver)
 {
@@ -171,24 +154,17 @@ int get_nameservers(list *servers)
 		// Add default ipv6 nameservers.
 		server = server_create(DEFAULT_IPV6_NAME, DEFAULT_DNS_PORT);
 
-		if (server != NULL) {                                   
-			add_tail(servers, (node *)server);              
+		if (server != NULL) {
+			add_tail(servers, (node *)server);
 		}
 
 		// Add default ipv4 nameservers.
 		server = server_create(DEFAULT_IPV4_NAME, DEFAULT_DNS_PORT);
 
-		if (server != NULL) {                                   
-			add_tail(servers, (node *)server);              
+		if (server != NULL) {
+			add_tail(servers, (node *)server);
 		}
 
 		return list_size(servers);
 	}
 }
-
-void server_free(server_t *server)
-{
-	free(server->name);
-	free(server->service);
-	free(server);
-}
diff --git a/src/utils/common/resolv.h b/src/utils/common/resolv.h
index 06ee309cfd9f3bd56ab19d27849e78903ef07cc2..64def44aaf4409f31cd592f667a2664df639da70 100644
--- a/src/utils/common/resolv.h
+++ b/src/utils/common/resolv.h
@@ -27,26 +27,8 @@
 #ifndef _UTILS__RESOLV_H_
 #define _UTILS__RESOLV_H_
 
-#include "common/lists.h"		// node
-
-#define DEFAULT_IPV4_NAME       "127.0.0.1"                                     
-#define DEFAULT_IPV6_NAME       "::1"
-#define DEFAULT_DNS_PORT        "53"
-#define SEP_CHARS               "\n\t "
-
-/*! \brief Structure containing nameserver information. */
-typedef struct {
-	/*!< List node (for list container). */
-	node	n;
-	/*!< Name or address of the server. */
-	char	*name;
-	/*!< Name or numbers of the service. */
-	char	*service;
-} server_t;
-
-server_t* server_create(const char *name, const char *service);
-
-void server_free(server_t *server);
+#include "common/lists.h"		// list
+#include "utils/common/netio.h"		// server_t
 
 server_t* parse_nameserver(const char *nameserver);
 
diff --git a/src/utils/nsupdate/nsupdate_exec.c b/src/utils/nsupdate/nsupdate_exec.c
index 02d36a5e44ef03093ac8eb7d0b48bc0a75d920e6..52e2e39322b2aab5a8da1e001061a45923a6bf09 100644
--- a/src/utils/nsupdate/nsupdate_exec.c
+++ b/src/utils/nsupdate/nsupdate_exec.c
@@ -29,7 +29,6 @@
 #include "utils/nsupdate/nsupdate_exec.h"
 #include "utils/common/msg.h"
 #include "utils/common/exec.h"
-#include "utils/common/resolv.h"
 #include "utils/common/netio.h"
 #include "common/errcode.h"
 #include "common/mempattern.h"
@@ -38,6 +37,7 @@
 #include "libknot/packet/response.h"
 #include "libknot/util/debug.h"
 #include "libknot/consts.h"
+#include "libknot/packet/query.h"
 
 /* Declarations of cmd parse functions. */
 typedef int (*cmd_handle_f)(const char *lp, params_t *params);
diff --git a/src/utils/nsupdate/nsupdate_params.c b/src/utils/nsupdate/nsupdate_params.c
index 830443c49d50cc5d7b938755dbcc3dd08e3255dc..600db40c9ee71c063c6d14e80da53655585d3528 100644
--- a/src/utils/nsupdate/nsupdate_params.c
+++ b/src/utils/nsupdate/nsupdate_params.c
@@ -22,9 +22,10 @@
 
 #include "utils/nsupdate/nsupdate_params.h"
 #include "utils/common/msg.h"
-#include "utils/common/resolv.h"
+#include "utils/common/netio.h"
 #include "libknot/util/descriptor.h"
 #include "common/errcode.h"
+#include "libknot/packet/packet.h"
 
 #define DEFAULT_RETRIES 3
 
diff --git a/src/utils/nsupdate/nsupdate_params.h b/src/utils/nsupdate/nsupdate_params.h
index 669563f52ce5368294a8594c955d5c45d146cab3..e8d6084e18c93522fd79b309c80f7e5b28ab7714 100644
--- a/src/utils/nsupdate/nsupdate_params.h
+++ b/src/utils/nsupdate/nsupdate_params.h
@@ -31,8 +31,8 @@
 
 #include "common/lists.h"		// list
 #include "utils/common/params.h"	// protocol_t
-#include "libknot/packet/query.h"
-#include "zscanner/scanner.h"
+#include "zscanner/scanner.h"		// scanner_t
+#include "libknot/packet/packet.h"	// knot_packet_t
 
 /*! Parser init string. */
 #define PARSER_INIT_STR "$ORIGIN %s\n$TTL %u\n"