diff --git a/nselib/coap.lua b/nselib/coap.lua
index a9fae79e5..474cb3c0c 100644
--- a/nselib/coap.lua
+++ b/nselib/coap.lua
@@ -3,7 +3,6 @@ local bit = require "bit"
 local comm = require "comm"
 local json = require "json"
 local lpeg = require "lpeg"
-local match = require "match"
 local math = require "math"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
diff --git a/nselib/data/packetdecoders.lua b/nselib/data/packetdecoders.lua
index 3062e421d..1a275543a 100644
--- a/nselib/data/packetdecoders.lua
+++ b/nselib/data/packetdecoders.lua
@@ -519,8 +519,8 @@ udp = {
       local p = packet.Packet:new( layer3, #layer3 )
       local data = layer3:sub(p.udp_offset + 9)
 
-      local dhcpv6 = require("dhcp6")
-      local resp = dhcpv6.DHCP6.Response.parse(data)
+      local dhcp6 = require("dhcp6")
+      local resp = dhcp6.DHCP6.Response.parse(data)
 
       for _, v in ipairs(resp.opts or {}) do
         if v.resp and v.resp.fqdn then
diff --git a/nselib/isns.lua b/nselib/isns.lua
index ba4c55826..7f4948a7c 100644
--- a/nselib/isns.lua
+++ b/nselib/isns.lua
@@ -5,7 +5,7 @@
 --
 
 local bin    = require('bin')
-local ipops  = require('ipOps')
+local ipOps  = require('ipOps')
 local match  = require('match')
 local nmap = require('nmap')
 local stdnse = require('stdnse')
@@ -481,10 +481,10 @@ Helper = {
         local pos, is_ipv4 = bin.unpack("A12", addr)
         if ( is_ipv4 == "\0\0\0\0\0\0\0\0\0\0\xFF\xFF" ) then
           local pos, bin_ip = bin.unpack("B4", addr, 13)
-          addr = ipops.bin_to_ip(bin_ip)
+          addr = ipOps.bin_to_ip(bin_ip)
         else
           local pos, bin_ip = bin.unpack("B16", addr)
-          addr = ipops.bin_to_ip(bin_ip)
+          addr = ipOps.bin_to_ip(bin_ip)
         end
       elseif ( attr.tag == Attribute.Tag.ISNS_TAG_PORTAL_TCP_UDP_PORT ) then
         local pos, s1
diff --git a/scripts/broadcast-hid-discoveryd.nse b/scripts/broadcast-hid-discoveryd.nse
index 87c5d7670..8bab09550 100644
--- a/scripts/broadcast-hid-discoveryd.nse
+++ b/scripts/broadcast-hid-discoveryd.nse
@@ -1,5 +1,4 @@
 local nmap = require "nmap"
-local packet = require "packet"
 local stdnse = require "stdnse"
 local string = require "string"
 local target = require "target"
diff --git a/scripts/broadcast-jenkins-discover.nse b/scripts/broadcast-jenkins-discover.nse
index 6789a3a7b..2cc95e7dd 100644
--- a/scripts/broadcast-jenkins-discover.nse
+++ b/scripts/broadcast-jenkins-discover.nse
@@ -1,5 +1,4 @@
 local nmap = require "nmap"
-local packet = require "packet"
 local stdnse = require "stdnse"
 local string = require "string"
 local os = require "os"
diff --git a/scripts/hostmap-crtsh.nse b/scripts/hostmap-crtsh.nse
index 5684652dc..36978970e 100644
--- a/scripts/hostmap-crtsh.nse
+++ b/scripts/hostmap-crtsh.nse
@@ -44,14 +44,12 @@ license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
 
 categories = {"external", "discovery"}
 
-local ipOps = require "ipOps"
 local io = require "io"
 local http = require "http"
 local stdnse = require "stdnse"
 local string = require "string"
 local target = require "target"
 local table = require "table"
-local shortport = require "shortport"
 
 -- Different from stdnse.get_hostname
 -- this function returns nil if the host is only known by IP address
diff --git a/scripts/ssl-enum-ciphers.nse b/scripts/ssl-enum-ciphers.nse
index c5a918028..690f04891 100644
--- a/scripts/ssl-enum-ciphers.nse
+++ b/scripts/ssl-enum-ciphers.nse
@@ -1,4 +1,3 @@
-local comm = require "comm"
 local coroutine = require "coroutine"
 local math = require "math"
 local nmap = require "nmap"