217.28.80.0/21

AS51800 · FIBER Network s.r.o.

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Summary

Country	Czechia
Domain	fiber.cz
ASN	AS51800
Registry	RIPE
ID	FIBER-NETWORKS-APA

WHOIS Details

inetnum:        217.28.80.0 - 217.28.87.255
netname:        FIBER-NETWORKS-APA
descr:          FIBER Networks customers
country:        CZ
org:            ORG-FNs4-RIPE
admin-c:        JK6086-RIPE
admin-c:        LM1397-RIPE
tech-c:         JK6086-RIPE
tech-c:         LM1397-RIPE
status:         ASSIGNED PA
mnt-by:         MNT-FIBERCZ
created:        2016-01-26T17:27:34Z
last-modified:  2016-01-26T17:27:34Z
source:         RIPE
abuse-email:    abuse@fiber.cz
abuse-c:        AFBR1
abuse-org:      ORG-FNs4-RIPE

organisation:   ORG-FNs4-RIPE
org-name:       FIBER Network s.r.o.
country:        CZ
org-type:       LIR
address:        Cimburkova 369/16
address:        130 00
address:        Prague 3
address:        CZECH REPUBLIC
phone:          +420222742742
fax-no:         +420222742744
e-mail:         jiri.kobilak@fiber.cz
abuse-c:        AFBR1
mnt-ref:        RIPE-NCC-HM-MNT
mnt-ref:        MNT-FIBERCZ
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         MNT-FIBERCZ
created:        2010-10-25T13:22:51Z
last-modified:  2020-12-16T13:18:11Z
source:         RIPE

person:         Jiri Kobilak
address:        FIBER Network
address:        Cimburkova 369/16
address:        13000 Praha 3
address:        Czech Republic / EU
e-mail:         info@fiber.cz
nic-hdl:        JK6086-RIPE
created:        2010-10-27T23:27:39Z
last-modified:  2010-11-10T18:23:34Z
source:         RIPE
phone:          +420222742742
mnt-by:         MNT-COBOOL

person:         Lukas Mesani
phone:          +420-222-742-740
address:        Czech Republic
nic-hdl:        LM1397-RIPE
mnt-by:         MNT-FRODO
created:        2006-06-07T13:57:53Z
last-modified:  2020-03-03T14:23:08Z
source:         RIPE

route:          217.28.80.0/21
descr:          CZFIBERNET1
origin:         AS51800
mnt-by:         MNT-FIBERCZ
created:        2010-11-09T17:53:32Z
last-modified:  2010-11-09T17:53:32Z
source:         RIPE

Nearby Ranges

BGP prefixes that overlap with 217.28.0.0/16

Range	ASN	Company	Num of IPs
217.28.32.0/20	AS12684	SES ASTRA S.A.	4,096
217.28.144.0/20	AS12741	Petrotel Sp. z o.o.	4,096
217.28.0.0/20	AS13122	Manx Telecom Trading Ltd	4,096
217.28.224.0/20	AS200350	Yandex.Cloud LLC	4,096
217.28.48.0/20	AS28886	RETN Limited	4,096
217.28.112.0/20	AS29270	Triskel srl	4,096
217.28.176.0/20	AS29689	Origo ehf	4,096
217.28.240.0/20	AS3327		4,096
217.28.192.0/20	AS34385	Tripnet AB	4,096
217.28.168.0/21	AS3292	Stibo Software Group A/S	2,048
217.28.8.0/21	AS13122	Residential ADSL - Manx Telecom	2,048
217.28.16.0/21	AS25582	NWIP Ltd	2,048
217.28.72.0/21	AS48524	INTERRA telecommunications group, Ltd.	2,048
217.28.88.0/21	AS57707	FIBER Networks customers	2,048
217.28.24.0/21	AS398721	Cogeco Connexion inc	2,048
217.28.0.0/21	AS13122	Residential ADSL - Manx Telecom	2,048
217.28.68.0/22	AS39120	Convergenze S.p.A.	1,024
217.28.164.0/22	AS3292	Stibo Software Group A/S	1,024
217.28.64.0/22	AS44092	HAL Service SpA	1,024
217.28.160.0/23	AS3292	Stibo Software Group A/S	512
217.28.140.0/24	AS204057	Duomenu apdorojimo centras LTD	256
217.28.143.0/24	AS20879	Digi Portugal, Sociedade Unipessoal LDA	256
217.28.133.0/24	AS210045	Blackrock Clinic Unlimited Company	256
217.28.128.0/24	AS212384	Xantho UAB	256
217.28.130.0/24	AS56322	MB Eisina	256
217.28.136.0/24	AS56488	Eis S.r.l.	256
217.28.162.0/24	AS3292	Stibo Software Group A/S	256
217.28.163.0/24	AS7018	Stibo Systems Inc	256
217.28.131.0/24	AS34859	Navant LLC	256
217.28.137.0/24	AS199524	G-Core Labs S.A.	256
217.28.134.0/24	AS203821	Enformatel Sp. z o.o.	256
217.28.139.0/24	AS208425	Osbil Technology Ltd.	256

Hosted domains

There are 38 domain names hosted across 16 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address	Domain	Domains on this IP
217.28.81.67	lesovnazofin.cz	7
217.28.81.68	ccshpraha.cz	7
217.28.82.23	primerack.cz	6
217.28.80.23	praha3.net	4
217.28.80.2	kobnet.cz	3
217.28.84.4	neutral.cz	2
217.28.82.9	myitguru.eu	1
217.28.82.70	blankanet.cz	1
217.28.81.66	katovice.cz	1
217.28.84.38	dsal.cc	1
217.28.84.6	mamlux.eu	1
217.28.84.5	mamlux.cz	1
217.28.81.71	katovice.cz	1
217.28.82.85	tejapo.cz	1
217.28.82.51	jagos.eu	1
217.28.84.8	kramekuzvonicky.cz	1

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.

Useful for Cybersecurity

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Pingable IPs

158 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address	ASN	Details
217.28.84.74	AS51800 FIBER Network s.r.o.	`0.35ms` from Prague, CZ
217.28.81.225	AS51800 FIBER Network s.r.o.	`0.35ms` from Prague, CZ
217.28.82.69	AS51800 FIBER Network s.r.o.	`0.48ms` from Prague, CZ
217.28.80.46	AS51800 FIBER Network s.r.o.	`0.29ms` from Prague, CZ

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address	ASN	Details
85.214.169.53	AS6724 Strato GmbH	`0.49ms` from Berlin, DE
213.157.176.165	AS8708 DIGI ROMANIA S.A.	`0.34ms` from Bucharest, RO
41.37.41.197	AS8452 TE-AS	`5.68ms` from Cairo, EG
197.51.68.85	AS8452 TE-AS	`7.80ms` from Cairo, EG
105.72.59.5	AS36884 Wana Corporate	`4.75ms` from Casablanca, MA
173.26.74.133	AS30036 Mediacom Communications Corp	`7.89ms` from Chicago, US
113.176.201.181	AS45899 VNPT Corp	`2.55ms` from Da Nang, VN
169.48.219.85	AS36351 IBM Cloud	`0.88ms` from Dallas, US
89.252.172.53	AS51559 Netinternet Bilisim Teknolojileri AS	`0.10ms` from Denizli, TR
195.30.227.69	AS5539 SpaceNet AG	`5.55ms` from Frankfurt am Main, DE
14.172.227.53	AS45899 VNPT Corp	`3.80ms` from Ho Chi Minh City, VN
182.70.2.37	AS24560 Bharti Airtel Ltd., Telemedia Services	`2.20ms` from Lohogaon, IN
94.142.144.101	AS12481 Planetel Nordest SRL	`4.85ms` from Milan, IT
91.201.203.21	AS197684 DeRoy LLC.	`0.14ms` from Naaldwijk, NL
188.122.192.229	AS57728 CEZNET s.r.o.	`4.08ms` from Prague, CZ
61.228.230.117	AS3462 Data Communication Business Group	`1.43ms` from Taipei, TW
60.144.200.37	AS17676 SoftBank Corp.	`3.93ms` from Tokyo, JP
178.188.63.37	AS8447 A1 Telekom Austria AG	`4.70ms` from Vienna, AT
86.119.86.5	AS559 SWITCH	`1.14ms` from Zuerich, CH
84.41.149.117	AS33915 Vodafone Libertel B.V.	`1.38ms` from Amsterdam, NL
94.124.143.5	AS39637 ADES BV	`1.59ms` from Amsterdam, NL
71.204.37.229	AS7922 Comcast Cable Communications, LLC	`3.09ms` from Atlanta, US
202.180.67.117	AS9790 Two Degrees Networks Limited	`0.48ms` from Auckland, NZ
43.168.4.21	AS139341 ACE	`1.20ms` from Bangkok, TH
44.249.99.69	AS16509 Amazon.com, Inc.	`0.59ms` from Boardman, US

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

traceroute -a -n -q1 -f2 217.28.84.73

traceroute to 217.28.84.73 (217.28.84.73): 64 hops max, 52 byte packets

2 [AS29134] 217.31.48.15 0.467 ms

3 [AS51800] 217.28.84.73 0.369 ms

Measurement taken from

IPinfo ProbeNet in Prague, CZ

On February 7th 2026

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

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