ef.co.kr ▷ EF Education First

Quick Summary

Online Status

Offline

Server IP address resolved: No
Http response code: None
Last Checked: 08/16/2025

Ef.co.kr traffic volume is 1,732 unique daily visitors and their 1,732 pageviews. The web value rate of ef.co.kr is 23,433 USD. Each visitor makes around 1.07 page views on average.

By Alexa's traffic estimates ef.co.kr placed at 30,866 position over the world.

Ef.co.kr registered under .KR top-level domain. Check other websites in .KR zone.

The last verification results, performed on (August 08, 2024) ef.co.kr show that ef.co.kr has an expired SSL certificate issued by Google Trust Services (expired on October 13, 2024). Click “Refresh” button for SSL Information at the Safety Information section. Check the list of websites using SSL certificates issued by Google Trust Services.

In accordance with Google Safe Browsing, Google Safe Search and Symantec ef.co.kr is pretty a safe domain.

Relying Google MobileFriendly test ef.co.kr is well optimized for mobile and tablet devices, however web page loading speed may be improved.

Ef.co.kr General Information

Global Rank

427,079

Average Load Time

0.00sec

Links In Count

Website Value

$21,900

Audience Geography. Where are ef.co.kr visitors located?

Country	Visitors

Country	Pageviews

Country	Rank

Where do visitors go on ef.co.kr?

Subdomain	Pageviews

Subdomain	Pageviews per User

Subdomain	Reach

How popular is ef.co.kr?

Period	Global Rank	Global Rank Delta
past 3 months	427079	107618
past month	552639	36371
past week	299991	0

Days	Pageviews Rank	Pageviews Rank Delta	Pageviews per Million	Pageviews per Million Delta	Pageviews per User	Pageviews per User Delta
90	629488	203269	5	-36.14%	1	-19.65%
30	801981	35276	4	-6.161%	1	0.8%
7	482353	0	8	0%	1	0%

Days	Reach Rank	Reach Rank Delta	Reach per Million	Reach per Million Delta
90	370207	73029	14	-21%
30	478929	39170	1	-6.917%
7	226555	0	3	0%

Ef.co.kr Safety Information

Overview

Last Updated: 08/16/2025

Overall result - ef.co.kr is safe.

We gather website safety and reputation data and compare it with available third-party sources so we calculate own safety and trustworthiness rate based on information that we get.

Norton Connect Safe

Last Updated: 04/02/2025

ef.co.kr is safe.

Norton ConnectSafe evaluates ef.co.kr for any unsafe and insecure content. The results are critical for families with young children.

Google Safe Search

Last Updated: 09/14/2019

ef.co.kr is safe.

SafeSearch is used as a parental control tool to filter out any inappropriate for your children search results on your devices: phones, tablets or personal computers.

Google Safe Browsing

Last Updated: 01/09/2019

ef.co.kr is safe.
Malware: not found.
Phishing: not detected.
Unwanted software: not found.
Harmfull applications: not found.

Google Safe Browsing notifies when websites are compromised by malicious actors. These protections work across Google products and provide a safer online experience.

Site Advisor

Last Updated: 03/02/2021

ef.co.kr is safe.

McAfee assesses ef.co.kr for a meaningful set of security threats. Featured dangers from annoying pop-ups to hidden Trojans, that can steal your identity, will be revealed. McAfee does not analyze ef.co.kr for mature or inappropriate content, only security checks are evaluated.

Web of Trust

Last Updated: 08/16/2025

ef.co.kr child safety is unknown.

The WOT calculates reputation of the ef.co.kr. This reputation system receives ratings from users and information from third-party sources, assesses the ef.co.kr for safety features and confirms, whether ef.co.kr is suitable for children.

SSL Information

SSL Checker Tool

Domain	ef.co.kr
Issuer Organization	Google Trust Services
Issuer	WE1
Algorithm	ecdsa-with-SHA256
Valid form	07/15/2024
Expiration	10/13/2024
Signed	Certificate is not self signed
Additional Domains	ef.co.kr *.ef.co.kr

Ef.co.kr Server Information

Server Location

Geolocation Tool

ASN Information

ASN Lookup Tool

ASN ID: 13335
ASN Title: CLOUDFLARENET - Cloudflare, Inc., US

Last Update: 12/23/2024

ASN Whois

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

ASNumber: 13335
ASName: CLOUDFLARENET
ASHandle: AS13335
RegDate: 2010-07-14
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/autnum/13335

OrgName: Cloudflare, Inc.
OrgId: CLOUD14
Address: 101 Townsend Street
City: San Francisco
StateProv: CA
PostalCode: 94107
Country: US
RegDate: 2010-07-09
Updated: 2017-02-17
Comment: All Cloudflare abuse reporting can be done via https://www.cloudflare.com/abuse
Ref: https://rdap.arin.net/registry/entity/CLOUD14

OrgTechHandle: ADMIN2521-ARIN
OrgTechName: Admin
OrgTechPhone: +1-650-319-8930
OrgTechEmail: rir@cloudflare.com
OrgTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

OrgAbuseHandle: ABUSE2916-ARIN
OrgAbuseName: Abuse
OrgAbusePhone: +1-650-319-8930
OrgAbuseEmail: abuse@cloudflare.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

OrgNOCHandle: NOC11962-ARIN
OrgNOCName: NOC
OrgNOCPhone: +1-650-319-8930
OrgNOCEmail: noc@cloudflare.com
OrgNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RNOCHandle: NOC11962-ARIN
RNOCName: NOC
RNOCPhone: +1-650-319-8930
RNOCEmail: noc@cloudflare.com
RNOCRef: https://rdap.arin.net/registry/entity/NOC11962-ARIN

RTechHandle: ADMIN2521-ARIN
RTechName: Admin
RTechPhone: +1-650-319-8930
RTechEmail: rir@cloudflare.com
RTechRef: https://rdap.arin.net/registry/entity/ADMIN2521-ARIN

RAbuseHandle: ABUSE2916-ARIN
RAbuseName: Abuse
RAbusePhone: +1-650-319-8930
RAbuseEmail: abuse@cloudflare.com
RAbuseRef: https://rdap.arin.net/registry/entity/ABUSE2916-ARIN

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/whois_tou.html
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/whois_reporting/index.html
#
# Copyright 1997-2018, American Registry for Internet Numbers, Ltd.
#

Ef.co.kr Domain Name Information

WHOIS

WHOIS Lookup Tool

Domain Whois

query : ef.co.kr

# KOREAN(UTF8)

도메인이름 : ef.co.kr
등록인 : (주) 지선소프트
등록인 주소 : 경기도 성남시 분당구 삼평동 670번지 유스페이스1 B동 4층
등록인 우편번호 : 137920
책임자 : Melbourne IT DBS, Inc.
책임자 전자우편 : domainadmintl@ef.com
책임자 전화번호 : 82-2-345-5210
등록일 : 1999. 04. 27.
최근 정보 변경일 : 2021. 12. 13.
사용 종료일 : 2022. 10. 15.
정보공개여부 : Y
등록대행자 : (주)가비아(http://www.gabia.co.kr)
DNSSEC : 미서명
등록정보 보호 : clientTransferProhibited

1차 네임서버 정보
호스트이름 : anirban.ns.cloudflare.com

2차 네임서버 정보
호스트이름 : pam.ns.cloudflare.com

네임서버 이름이 .kr이 아닌 경우는 IP주소가 보이지 않습니다.

# ENGLISH

Domain Name : ef.co.kr
Registrant : EF Education First Korea
Registrant Address : 4Fl. B Tower Kyobo Tower Bldg., 1303-22 Seocho-Dong, Seocho-Gu
Registrant Zip Code : 137920
Administrative Contact(AC) : Domain Administrator
AC E-Mail : domainadmintl@ef.com
AC Phone Number : 82-2-345-5210
Registered Date : 1999. 04. 27.
Last Updated Date : 2021. 12. 13.
Expiration Date : 2022. 10. 15.
Publishes : Y
Authorized Agency : Gabia, Inc.(http://www.gabia.co.kr)
DNSSEC : unsigned
Domain Status : clientTransferProhibited

Primary Name Server
Host Name : anirban.ns.cloudflare.com

Secondary Name Server
Host Name : pam.ns.cloudflare.com

- KISA/KRNIC WHOIS Service -

DNS Records

DNS Lookup Tool

Host	A Record	TTL

Host	MX Record	Priority	TTL

Host	NS Record	TTL

Host	TXT Record	TTL

Ef.co.kr HTML Validation

HTML Validation Tool

Errors

Stray doctype.

Bad value “og:http://ogp.me/ns#” for attribute “prefix” on element “html”.

A “link” element with a “sizes” attribute must have a “rel” attribute that contains the value “icon” or the value “apple-touch-icon”.

Bad value “Set-Cookie” for attribute “http-equiv” on element “meta”.

Attribute “arial-label” not allowed on element “a” at this point.

Attribute “aria-role” not allowed on element “a” at this point.

Bad value “tel:1644-9644, 02-6979-9600” for attribute “href” on element “a”: Illegal character in scheme data: space is not allowed.

Element “bgpicture” not allowed as child of element “div” in this context. (Suppressing further errors from this subtree.)

Bad value “” for attribute “target” on element “a”: Browsing context name must be at least one character long.

No space between attributes.

Bad value “//schema.org/” for attribute “vocab” on element “div”: The string “//schema.org/” is not an absolute URL.

Element “h2” not allowed as child of element “span” in this context. (Suppressing further errors from this subtree.)

Warnings

Consider avoiding viewport values that prevent users from resizing documents.

Section lacks heading. Consider using “h2”-“h6” elements to add identifying headings to all sections.

Ef.co.kr Desktop Insights

Last tested: 12/04/2017

Desktop

Desktop Speed

69%

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Avoid landing page redirects

Leverage browser caching

Reduce server response time

Optimize images

Minify JavaScript

Minify HTML

Desktop Resource Breakdown

Total Resources	68
Number of Hosts	25
Static Resources	31
JavaScript Resources	26
CSS Resources	5

Ef.co.kr Mobile Insights

Last tested: 12/04/2017

Mobile

Mobile Usability

99%

Size tap targets appropriately

Mobile Speed

45%

Eliminate render-blocking JavaScript and CSS in above-the-fold content

Avoid landing page redirects

Optimize images

Leverage browser caching

Reduce server response time

Minify JavaScript

Minify HTML

Mobile Resource Breakdown

Total Resources	71
Number of Hosts	26
Static Resources	33
JavaScript Resources	26
CSS Resources	5

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Ef.co.kr EF Education First | 코리아

50년 역사의 세계 최대 교육 기업 EF는 여러분이 세계 무대에서 꿈을 펼칠 수 있도록 문화 교류와 학업적 성취, 여행 등을 결합한 어학연수와 유학 프로그램을 제공합니다.

Quick Summary

Ef.co.kr General Information

Ef.co.kr Safety Information

Ef.co.kr Server Information

Ef.co.kr Domain Name Information

Ef.co.kr HTML Validation

Ef.co.kr Desktop Insights

Ef.co.kr Mobile Insights

Ef.co.kr Nearest Competitors

Ef.co.kr Typos