diff --git a/packages/web3-eth-iban/src/index.js b/packages/web3-eth-iban/src/index.js
index 6fdbc99fcb8..3e79e1ee544 100644
--- a/packages/web3-eth-iban/src/index.js
+++ b/packages/web3-eth-iban/src/index.js
@@ -25,12 +25,12 @@
 
 "use strict";
 
-var utils = require('web3-utils');
-var BigNumber = require('bn.js');
+const utils = require('web3-utils');
+const BigNumber = require('bn.js');
 
 
-var leftPad = function (string, bytes) {
-    var result = string;
+const leftPad = function (string, bytes) {
+    let result = string;
     while (result.length < bytes * 2) {
         result = '0' + result;
     }
@@ -45,16 +45,16 @@ var leftPad = function (string, bytes) {
  * @param {String} iban the IBAN
  * @returns {String} the prepared IBAN
  */
-var iso13616Prepare = function (iban) {
-    var A = 'A'.charCodeAt(0);
-    var Z = 'Z'.charCodeAt(0);
+const iso13616Prepare = function (iban) {
+    const A = 'A'.charCodeAt(0);
+    const Z = 'Z'.charCodeAt(0);
 
     iban = iban.toUpperCase();
     iban = iban.substr(4) + iban.substr(0,4);
 
-    return iban.split('').map(function(n){
-        var code = n.charCodeAt(0);
-        if (code >= A && code <= Z){
+    return iban.split('').map(function(n) {
+        const code = n.charCodeAt(0);
+        if (code >= A && code <= Z) {
             // A = 10, B = 11, ... Z = 35
             return code - A + 10;
         } else {
@@ -70,9 +70,9 @@ var iso13616Prepare = function (iban) {
  * @param {String} iban
  * @returns {Number}
  */
-var mod9710 = function (iban) {
-    var remainder = iban,
-        block;
+const mod9710 = function (iban) {
+    let remainder = iban;
+    let block;
 
     while (remainder.length > 2){
         block = remainder.slice(0, 9);
@@ -87,181 +87,183 @@ var mod9710 = function (iban) {
  *
  * @param {String} iban
  */
-var Iban = function Iban(iban) {
-    this._iban = iban;
-};
-
-/**
- * This method should be used to create an ethereum address from a direct iban address
- *
- * @method toAddress
- * @param {String} iban address
- * @return {String} the ethereum address
- */
-Iban.toAddress = function (ib) {
-    ib = new Iban(ib);
-
-    if(!ib.isDirect()) {
-        throw new Error('IBAN is indirect and can\'t be converted');
+class Iban {
+    constructor (iban) {
+        this._iban = iban;
     }
 
-    return ib.toAddress();
-};
-
-/**
- * This method should be used to create iban address from an ethereum address
- *
- * @method toIban
- * @param {String} address
- * @return {String} the IBAN address
- */
-Iban.toIban = function (address) {
-    return Iban.fromAddress(address).toString();
-};
+    /**
+     * This method should be used to create an ethereum address from a direct iban address
+     *
+     * @method toAddress
+     * @param {String} iban address
+     * @return {String} the ethereum address
+     */
+    static toAddress (ib) {
+        ib = new Iban(ib);
+
+        if(!ib.isDirect()) {
+            throw new Error('IBAN is indirect and can\'t be converted');
+        }
 
-/**
- * This method should be used to create iban object from an ethereum address
- *
- * @method fromAddress
- * @param {String} address
- * @return {Iban} the IBAN object
- */
-Iban.fromAddress = function (address) {
-    if(!utils.isAddress(address)){
-        throw new Error('Provided address is not a valid address: '+ address);
+        return ib.toAddress();
     }
 
-    address = address.replace('0x','').replace('0X','');
-
-    var asBn = new BigNumber(address, 16);
-    var base36 = asBn.toString(36);
-    var padded = leftPad(base36, 15);
-    return Iban.fromBban(padded.toUpperCase());
-};
-
-/**
- * Convert the passed BBAN to an IBAN for this country specification.
- * Please note that <i>"generation of the IBAN shall be the exclusive responsibility of the bank/branch servicing the account"</i>.
- * This method implements the preferred algorithm described in http://en.wikipedia.org/wiki/International_Bank_Account_Number#Generating_IBAN_check_digits
- *
- * @method fromBban
- * @param {String} bban the BBAN to convert to IBAN
- * @returns {Iban} the IBAN object
- */
-Iban.fromBban = function (bban) {
-    var countryCode = 'XE';
-
-    var remainder = mod9710(iso13616Prepare(countryCode + '00' + bban));
-    var checkDigit = ('0' + (98 - remainder)).slice(-2);
-
-    return new Iban(countryCode + checkDigit + bban);
-};
-
-/**
- * Should be used to create IBAN object for given institution and identifier
- *
- * @method createIndirect
- * @param {Object} options, required options are "institution" and "identifier"
- * @return {Iban} the IBAN object
- */
-Iban.createIndirect = function (options) {
-    return Iban.fromBban('ETH' + options.institution + options.identifier);
-};
-
-/**
- * This method should be used to check if given string is valid iban object
- *
- * @method isValid
- * @param {String} iban string
- * @return {Boolean} true if it is valid IBAN
- */
-Iban.isValid = function (iban) {
-    var i = new Iban(iban);
-    return i.isValid();
-};
-
-/**
- * Should be called to check if iban is correct
- *
- * @method isValid
- * @returns {Boolean} true if it is, otherwise false
- */
-Iban.prototype.isValid = function () {
-    return /^XE[0-9]{2}(ETH[0-9A-Z]{13}|[0-9A-Z]{30,31})$/.test(this._iban) &&
-        mod9710(iso13616Prepare(this._iban)) === 1;
-};
-
-/**
- * Should be called to check if iban number is direct
- *
- * @method isDirect
- * @returns {Boolean} true if it is, otherwise false
- */
-Iban.prototype.isDirect = function () {
-    return this._iban.length === 34 || this._iban.length === 35;
-};
+    /**
+     * This method should be used to create iban address from an ethereum address
+     *
+     * @method toIban
+     * @param {String} address
+     * @return {String} the IBAN address
+     */
+    static toIban (address) {
+        return Iban.fromAddress(address).toString();
+    }
 
-/**
- * Should be called to check if iban number if indirect
- *
- * @method isIndirect
- * @returns {Boolean} true if it is, otherwise false
- */
-Iban.prototype.isIndirect = function () {
-    return this._iban.length === 20;
-};
+    /**
+     * This method should be used to create iban object from an ethereum address
+     *
+     * @method fromAddress
+     * @param {String} address
+     * @return {Iban} the IBAN object
+     */
+    static fromAddress (address) {
+        if(!utils.isAddress(address)){
+            throw new Error('Provided address is not a valid address: '+ address);
+        }
 
-/**
- * Should be called to get iban checksum
- * Uses the mod-97-10 checksumming protocol (ISO/IEC 7064:2003)
- *
- * @method checksum
- * @returns {String} checksum
- */
-Iban.prototype.checksum = function () {
-    return this._iban.substr(2, 2);
-};
+        address = address.replace('0x','').replace('0X','');
 
-/**
- * Should be called to get institution identifier
- * eg. XREG
- *
- * @method institution
- * @returns {String} institution identifier
- */
-Iban.prototype.institution = function () {
-    return this.isIndirect() ? this._iban.substr(7, 4) : '';
-};
+        const asBn = new BigNumber(address, 16);
+        const base36 = asBn.toString(36);
+        const padded = leftPad(base36, 15);
+        return Iban.fromBban(padded.toUpperCase());
+    }
 
-/**
- * Should be called to get client identifier within institution
- * eg. GAVOFYORK
- *
- * @method client
- * @returns {String} client identifier
- */
-Iban.prototype.client = function () {
-    return this.isIndirect() ? this._iban.substr(11) : '';
-};
+    /**
+     * Convert the passed BBAN to an IBAN for this country specification.
+     * Please note that <i>"generation of the IBAN shall be the exclusive responsibility of the bank/branch servicing the account"</i>.
+     * This method implements the preferred algorithm described in http://en.wikipedia.org/wiki/International_Bank_Account_Number#Generating_IBAN_check_digits
+     *
+     * @method fromBban
+     * @param {String} bban the BBAN to convert to IBAN
+     * @returns {Iban} the IBAN object
+     */
+    static fromBban (bban) {
+        const countryCode = 'XE';
+
+        const remainder = mod9710(iso13616Prepare(countryCode + '00' + bban));
+        const checkDigit = ('0' + (98 - remainder)).slice(-2);
+
+        return new Iban(countryCode + checkDigit + bban);
+    }
 
-/**
- * Should be called to get client direct address
- *
- * @method toAddress
- * @returns {String} ethereum address
- */
-Iban.prototype.toAddress = function () {
-    if (this.isDirect()) {
-        var base36 = this._iban.substr(4);
-        var asBn = new BigNumber(base36, 36);
-        return utils.toChecksumAddress(asBn.toString(16, 20));
+    /**
+     * Should be used to create IBAN object for given institution and identifier
+     *
+     * @method createIndirect
+     * @param {Object} options, required options are "institution" and "identifier"
+     * @return {Iban} the IBAN object
+     */
+    static createIndirect (options) {
+        return Iban.fromBban('ETH' + options.institution + options.identifier);
     }
 
-    return '';
-};
+    /**
+     * This method should be used to check if given string is valid iban object
+     *
+     * @method isValid
+     * @param {String} iban string
+     * @return {Boolean} true if it is valid IBAN
+     */
+    static isValid (iban) {
+        const i = new Iban(iban);
+        return i.isValid();
+    };
+
+    /**
+     * Should be called to check if iban is correct
+     *
+     * @method isValid
+     * @returns {Boolean} true if it is, otherwise false
+     */
+    isValid () {
+        return /^XE[0-9]{2}(ETH[0-9A-Z]{13}|[0-9A-Z]{30,31})$/.test(this._iban) &&
+            mod9710(iso13616Prepare(this._iban)) === 1;
+    };
+
+    /**
+     * Should be called to check if iban number is direct
+     *
+     * @method isDirect
+     * @returns {Boolean} true if it is, otherwise false
+     */
+    isDirect () {
+        return this._iban.length === 34 || this._iban.length === 35;
+    };
+
+    /**
+     * Should be called to check if iban number if indirect
+     *
+     * @method isIndirect
+     * @returns {Boolean} true if it is, otherwise false
+     */
+    isIndirect () {
+        return this._iban.length === 20;
+    };
+
+    /**
+     * Should be called to get iban checksum
+     * Uses the mod-97-10 checksumming protocol (ISO/IEC 7064:2003)
+     *
+     * @method checksum
+     * @returns {String} checksum
+     */
+    checksum () {
+        return this._iban.substr(2, 2);
+    };
+
+    /**
+     * Should be called to get institution identifier
+     * eg. XREG
+     *
+     * @method institution
+     * @returns {String} institution identifier
+     */
+    institution () {
+        return this.isIndirect() ? this._iban.substr(7, 4) : '';
+    };
+
+    /**
+     * Should be called to get client identifier within institution
+     * eg. GAVOFYORK
+     *
+     * @method client
+     * @returns {String} client identifier
+     */
+    client () {
+        return this.isIndirect() ? this._iban.substr(11) : '';
+    };
+
+    /**
+     * Should be called to get client direct address
+     *
+     * @method toAddress
+     * @returns {String} ethereum address
+     */
+    toAddress () {
+        if (this.isDirect()) {
+            const base36 = this._iban.substr(4);
+            const asBn = new BigNumber(base36, 36);
+            return utils.toChecksumAddress(asBn.toString(16, 20));
+        }
 
-Iban.prototype.toString = function () {
-    return this._iban;
-};
+        return '';
+    };
+
+    toString () {
+        return this._iban;
+    };
+}
 
 module.exports = Iban;