edu.pl | DNSViz

edu.pl

Updated: 2023-09-05 03:34:25 UTC (397 days ago) Go to most recent »

DNS Server Responses

Responses for edu.pl/DS

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
edu.pl	86400	DS	30310 8 2 376063e6f1258f2e9317c36f8f487ccda5682bc76c8be427e60d1f32065c2ae4	OK	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
	86400	RRSIG	DS 8 2 86400 20231003120000 20230903120000 10458 pl. OoTdtGJeAlbu2r3Uw5pCjzvu85DeaclE AetfBKFEXiMuBocg/6+ETMy7jbbF9YcF alIyCbK2qSWElFDpjTKnmmWSPmJCmt+e 9v1Ty2tB8szgfsVOfB6XYy6h/4B1it+y EFOQmVVpLVmqxj0nepjmwT49eSywta/Y 702sIQa03bKVk7QpmIT2N4/Z7BVfI2My 4LeF/lsTC0eUh1INNcdCgtrLYoU6a5Tb 5CRflVXiPQ5un/rtJaFDDE6+6E+G0OIk Qe4hLIwJQDm9MIrZs5ztPeL4GZeoo+gF pkgOHTLDekqYXNy3Zo29p1Rr7+zhguVF zntCxsv8B3T1C0shya1B+w==	VALID	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
RR count (Answer/Authority/Additional)				OK	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1	2/0/1
Response size (bytes)				OK	411	411	411	411	381	381	373	395	395	381	381	414	414
Response time (ms)				OK	193	192	142	155	83	84	193	23	156	65	65	17	17

Responses for edu.pl/DNSKEY

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
edu.pl	86400	DNSKEY	256 3 8 AwEAAbidICh7DcbMWfCTMpbp7L0PJSib kmh1Ods+isMMVwtMjWhC59gKd+IAz8Rg vCDGYEzPbodeYCJGEcDG0zuBp1Z8IZ/U MdEmvpXdxjx4M/w0Ti1Mk75Ee8l1W4YH DXToCJ4FopsH7fVLyfSISDzEIGfDEBPe rhSl/G7bXN1mwvdrfC39raaEmZslniQZ Km1GZzYUtKYgK7lHFjA3zUtFn6L3nU+R ZpdYxOnyQDnKhAPzJ+bvroKCANZE7iWC g2lgs1R1G8iok/Obv/5aiIiN8ibe0qFu cD0FKoVfj0jP87R1fO8oUcmil59LaqeY 4P2UgXogfEz6fOIR7ikH6hEEaBk= ; key tag = 14223 257 3 8 AwEAAdvAqbOg4DgwX5VtFNIJ3wdqL/2X 8lnAsts+xrOV4iNc+GCqhdXdRkhcRe37 edCsylVxGqyQhhuxwE7NajjM1bTbR8kf 0ADvg+pnUKW4Y9Patg5yc834ZQt2kLDY OfXoDESEwfAu3+IoEFGSh23oxAW9r9sv xlTRk2Y0bMh8JlhUNl1onbttyGjpP6sq RLQ+T8z/9CatyZBX040odHyjsTjmM+1n JlaZJzn9rULULwtN0gKQwdNDypwNd4w7 YabR6Savv9T3zGriUkolKNcyz5VsLdXJ XuORG6V4HsgWc5uhqhIWTMwj5aFX5T0U KhGRmTAkdZIATPM+Z9Zckn/JVgN0id3F hNakYGwjkdG2RC7YuyDo+OQ8TeKm6g20 MYbEcKHg4hwwUbZySrXrU6Xz4Khh6MK3 TyfKchBvSrgi4EEEeCL3/bKl4dNJdw/8 K2N4uMkSCIzPgB6w38UFRmpjtPhbaFni jK6jN91meZU/SfWfazrAHVxzvingJ2pK 17SUqYQDJvm9FE0H7r/nitYPqxDuEzpS QgyPymV7ycJCQol/6XmK3uffMduDZJIS 4WWmECGFQES1uuIczNwLGlYKFTx9twnI e+R6baRiH2SAT/ADFZjWhmXVb13UotU3 ZeiiVtykDnLeX5xQ+0fgtHv8RFGAFp/p 0lEypbd7LIotlA7l ; key tag = 30310	OK	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
	86400	RRSIG	DNSKEY 8 2 86400 20231003120000 20230903120000 30310 edu.pl. rKWBbYV+XCS8hZscZlxyVgoXHjI4lAgi qSWTcawJh0t9GxvtCKDT9s3+ryIjh08s Zl1NIAcok5aX+zU3tr747ygtzmEznwiJ jAloKNoKNqwoxmrsaLMaVvFktPSLx7Pv RHWy4N7g3kjZ9uoRH4pEGEtTfvmagb2P 7c2ZNwMB6cjoKBEDB4hwZdIQDU6DmsMz Tx7NyfuxI3YsxRIruYZ4CqSomTvulBjh 8Eno778AHNx2pW56om87Y1R04LVhNiYb IoHD+WW797fH8jFba0T9vwydQlld0rLp UjckN3LEh2U5MzQ9G/58EmhPE+eqOl+I lvdRrDxGFgPab+7EKBSFog3S5PbNBpwx i9H4MYgpAKv07UXfgevusNFIGZPniqcA 5LAluryTJ9hNlSv+nD/iavYUsU0HATmk GQUY7nJFi4yyMBWfO5k+d8Q7vvszSlQC taQ1+dd5RCYp/3YtnBVysYlhBttA01ME hfvbRZo/7ij2D81gMYodTmYngNFr5Q9d 8HRVQtlhSxnsjul2FUcnvPr9JwiYDxRq /xG49PY+8CxKAXBaX2q/I3c2aGCkJwtz n96lZ+ixixFRuQ4C61hEdxVTBm2ZJEhB VUBTNkOcdoJt5p3oz/JXY2MpsThP2F7J pF55FtOY1lcilen4Pa1XaaULcZGudrcY y+ndNxgP/vs=	VALID	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
RR count (Answer/Authority/Additional)				OK	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1	3/0/1
Response size (bytes)				OK	1431	1431	1431	1431	1401	1401	1393	1415	1415	1401	1401	1434	1434
Response time (ms)				OK	315	309	254	259	141	135	309	41	265	84	83	42	40

Responses for edu.pl/NS

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
edu.pl	86400	NS	a-dns.pl. b-dns.pl. d-dns.pl. e-dns.pl. f-dns.pl. h-dns.pl. j-dns.pl.	OK	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
	86400	RRSIG	NS 8 2 86400 20231003120000 20230903120000 14223 edu.pl. LooJ8nYoUMtogbRurs4R/hy/uFtID++T cjQ8Dex4AB4vElonLsEp5UWMhMxkLvWe socyAIvfBGxDOnsyebDw1cTKZqx4Mhla cWWRYLv/6bATvJQI48L7ra2t0CwTujXQ MJO6JNCSmdHAwa5I2ln8jQP/s/8KnKfO jlRtzFVDN7Lwkv4Adhwvsb5X8KEzj39K hOOF9aIwGOs0zZxWHyVMnBRSY/mRkalw AnKlgnv2W5XiovV1Rv6vrNkzdASqT9v+ 3c4w4ul46DZJ63vLB7kg3y9OvAmB3iwj E+fa9x+2E0Wt70oUrIRKLWp7CR5cwIzA E7OWk8CzZgx6XZn78JPZbA==	VALID	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
RR count (Answer/Authority/Additional)				OK	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1
Response size (bytes)				OK	507	507	507	507	477	477	469	491	491	477	477	510	510
Response time (ms)				OK	158	156	128	130	56	59	153	8	132	23	27	2	4

Responses for edu.pl/MX

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
RR count (Answer/Authority/Additional)				OK	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1
Response size (bytes)				OK	808	808	808	808	778	778	768	790	790	778	778	811	811
Response time (ms)				OK	190	189	140	142	83	84	191	26	157	65	65	16	16

Responses for edu.pl/CNAME

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
RR count (Answer/Authority/Additional)				OK	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1
Response size (bytes)				OK	808	808	808	808	776	778	768	790	790	778	776	811	811
Response time (ms)				OK	191	189	142	157	83	83	191	24	139	64	64	14	15

Responses for edu.pl/TXT

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
RR count (Answer/Authority/Additional)				OK	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1
Response size (bytes)				OK	808	808	808	808	776	778	768	790	790	778	778	811	811
Response time (ms)				OK	219	218	164	165	87	87	220	44	165	68	68	44	43

Responses for edu.pl/SOA

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
edu.pl	86400	SOA	a-dns.pl. dnsmaster.nask.pl. 1693809087 900 300 2592000 3600	OK	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
	86400	RRSIG	SOA 8 2 86400 20231004231502 20230904221502 14223 edu.pl. a3rMRDFIgMFLg4staQwXOp+FKvTX3oBL vUFiCS/YgwitIatF+nvr2H6ZTiJAKwA1 eurbz1cILZ5ts6r5PJbh73BFVBN7XHgV 2PvJQJxFBmvtIz83DwvKHDvlCckEvwxm kGbaF6MMkXkZHAleC3+2yGOuC3+mpH/4 jjv1xiWqPMtlfRhg3mF1dh7mAoJuuC2B 09O4ABLrv+YFtfCGoRe9mxvfQu5BeE4/ c6anFdUhrTsBtddEKIrAVVGP+Ofev8bM mvAuU8BYwZ8eFTCpNBmRNymWLdmdWYt2 GfI2CnEi2+BrwT2nFFP3xWgbJdv8UHWN k79zM2fSwTM1Iw9bTX+FOw==	VALID	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
RR count (Answer/Authority/Additional)				OK	2/8/1	2/8/1	2/8/1	2/8/1	2/0/1	2/0/1	2/8/1	2/0/1	2/0/1	2/0/1	2/0/1	2/8/1	2/8/1
Response size (bytes)				OK	826	826	826	826	396	394	814	408	408	394	394	829	829
Response time (ms)				OK	333	338	254	258	128	128	330	72	261	93	93	47	46

Responses for edu.pl/NSEC3PARAM

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
edu.pl	0	NSEC3PARAM	1 0 12 34d67d45845f8eb4	OK	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
	0	RRSIG	NSEC3PARAM 8 2 0 20231003120000 20230903120000 14223 edu.pl. K+wJ/MiLl8c7zoxXMJCZyd4t7zDWT9Hl UW+hEXqX1EVP+b5fLA0f509dMZT6D+aR RMC3/CtRlcIghVQV6jdGHRuX/6GKHH2/ cQYVJuUTIqivEd524CI9HKqCv5fnpp4/ 2JLWyohnoxSicC7JWggFLd79Oz4DuyHs gHWemhSwpPex29yCCpFLukSv/LaQGEQj R3ZxibmdOXxVo+aDBrxLO7Ka6hfOZZgX L94lkwLxqQ901lR08vRAhSQXbA++rJI4 oX62ydKE/NrbiZGoI1xRwozZWtHmV61E D16AIPqWZCLw5gafdYwy5ehvEzq06IKa NBYI4CofrmCufELeuitPQA==	VALID	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
RR count (Answer/Authority/Additional)				OK	2/8/1	2/8/1	2/8/1	2/8/1	2/0/1	2/0/1	2/8/1	2/0/1	2/0/1	2/0/1	2/0/1	2/8/1	2/8/1
Response size (bytes)				OK	826	826	826	826	362	362	788	376	376	362	362	829	829
Response time (ms)				OK	206	203	143	142	85	85	208	32	142	66	66	30	28

Responses for 2b4ldifq86.edu.pl/A

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
RR count (Answer/Authority/Additional)				OK	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1	0/8/1
Response size (bytes)				OK	1583	1583	1583	1583	1553	1553	1541	1563	1563	1553	1549	1586	1586
Response time (ms)				OK	317	313	254	260	144	141	307	39	263	81	80	36	36

Responses for edu.pl/A

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
RR count (Answer/Authority/Additional)				OK	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1
Response size (bytes)				OK	808	808	808	808	776	778	768	790	790	778	778	811	811
Response time (ms)				OK	158	156	128	131	56	56	153	10	129	24	26	2	4

Responses for edu.pl/AAAA

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
RR count (Answer/Authority/Additional)				OK	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1	0/4/1
Response size (bytes)				OK	808	808	808	808	776	778	768	790	790	778	776	811	811
Response time (ms)				OK	222	220	163	163	89	88	224	50	168	69	67	49	49

Responses for edu.pl/NS

Name	TTL	Type	Data	Status	Returned by
Name	TTL	Type	Data	Status	a-dns.pl. (192.102.225.53)	a-dns.pl. (2001:7f9::53)	b-dns.pl. (192.195.72.53)	b-dns.pl. (2001:7f9:c::53)	d-dns.pl. (185.159.197.48)	d-dns.pl. (2620:10a:80aa::48)	e-dns.pl. (46.28.245.82)	f-dns.pl. (194.0.25.29)	f-dns.pl. (2001:678:20::29)	h-dns.pl. (185.159.198.48)	h-dns.pl. (2620:10a:80ab::48)	j-dns.pl. (204.61.217.4)	j-dns.pl. (2001:500:14:7004:ad::1)
edu.pl	86400	NS	a-dns.pl. b-dns.pl. d-dns.pl. e-dns.pl. f-dns.pl. h-dns.pl. j-dns.pl.	OK	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
	86400	RRSIG	NS 8 2 86400 20231003120000 20230903120000 14223 edu.pl. LooJ8nYoUMtogbRurs4R/hy/uFtID++T cjQ8Dex4AB4vElonLsEp5UWMhMxkLvWe socyAIvfBGxDOnsyebDw1cTKZqx4Mhla cWWRYLv/6bATvJQI48L7ra2t0CwTujXQ MJO6JNCSmdHAwa5I2ln8jQP/s/8KnKfO jlRtzFVDN7Lwkv4Adhwvsb5X8KEzj39K hOOF9aIwGOs0zZxWHyVMnBRSY/mRkalw AnKlgnv2W5XiovV1Rv6vrNkzdASqT9v+ 3c4w4ul46DZJ63vLB7kg3y9OvAmB3iwj E+fa9x+2E0Wt70oUrIRKLWp7CR5cwIzA E7OWk8CzZgx6XZn78JPZbA==	VALID	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y	Y
RR count (Answer/Authority/Additional)				OK	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1	8/0/1
Response size (bytes)				OK	507	507	507	507	477	477	469	491	491	477	477	510	510
Response time (ms)				OK	158	156	128	130	56	59	153	8	132	23	27	2	4