AS51350 TECHNIKUM-WIEN-AS Fachhochschule Technikum Wien

AS overview

Test target: 2001:67c:1790::1 · static prefix probe · address space: PI · prefixes announced: 1

prefix(es): 2001:67c:1790::/48

Targets & per-vantage-point probe results (1 target(s) across 7 vantage point(s))

Source codes (hover any badge for full description): CUR=curated · NS/SOA/MX=DNS records · SPF=SPF TXT · DRV=holder-derived (www, ns1, mail, gw, …) · ATL=RIPE Atlas · PDB=PeeringDB · WHOIS=RIPE whois · RDAP=RIPE RDAP · HIT=IPv6 Hitlist · RTR=in-prefix path hop (router) · PRB=static prefix probe · SYN=synthetic prefix::1 fallback

Target IP / hostname	Source	SRB host (SOX, Belgrade)					DE host (Berlin)					DE host (Düsseldorf)					NL host (go6lab)					ITA host (Karsolink)					SLO host (6connect)					SLO host (T-2)
Target IP / hostname	Source	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached	ping	1500B	:80	:443	reached
`2001:67c:1790::1`	prb	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	?	?	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓

VIX / AAIX / SAIX / TIROL-IX / ERA-IX peering

Not an VIX / AAIX / SAIX / TIROL-IX / ERA-IX member, but our traceroute path crosses the VIX / AAIX / SAIX / TIROL-IX / ERA-IX LAN from SRB host (SOX, Belgrade), DE host (Berlin), DE host (Düsseldorf), SLO host (6connect) - reached via an VIX / AAIX / SAIX / TIROL-IX / ERA-IX-resident transit operator.

RPKI & ASPA

0 of 1 prefix(es) covered by a valid ROA, 1 not-found.

Prefix	RPKI state	Reason	Covering VRP(s)
`2001:67c:1790::/48`	- not-found	no covering VRP

Random-IP probe (yarrp) into the AS' prefixes

At least one router inside AS51350's announced prefix replied during the random-target probe. Hop(s): 2001:67c:1790::1. These are candidate targets for direct testing.

ICMPv6 Type 2 (Packet Too Big) acceptance - active test

Type 2 honored. Forged ICMPv6 PTB (MTU=1280) was accepted by the destination's stack: the next 1500-byte Echo Reply arrived split into 2 fragments via the IPv6 Fragment Header.
method: ICMPv6 Echo + forged PTB, tested 2026-09-23T13:31:56Z

Multi-vantage path map

Every hop of all vantages’ traceroutes toward the target, drawn left→right, grouped into per-AS bubbles (a hop seen from several vantages is one shared bubble, so converging paths merge). It answers two questions per vantage — shown on each source bubble as echo ✓/⚠/✗ · trace ✓/✗: did the destination reply to ICMPv6 Echo (✓ honored, ⚠ replied but PTB not honored, ✗ no reply), and did the traceroute reach it. A line to the target is drawn only when that vantage got an echo reply — solid if the PTB was honored, dashed if not (reachable but a broken-PMTUD / RFC 4890 violation). The path depth still shows how far the traceroute itself got, and runs of unanswered (* *) hops collapse into one dashed “silent” bubble. Open full size ↗

● SRB host (SOX, Belgrade)
● DE host (Berlin)
● DE host (Düsseldorf)
● NL host (go6lab)
● ITA host (Karsolink)
● SLO host (6connect)
● SLO host (T-2)
── solid line = echo reply, PTB honored (clean reach)
— — dashed line = echo reply but PTB not honored (RFC 4890 violation)
no line = no echo reply (never reached)
◉ target: green = clean, amber = reachable-but-violation / unreachable
⚠ suspected drop AS
⋯ silent (unanswered) hops
● IXP hop

From SRB host (SOX, Belgrade) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 12.8ms

4/4

Echo 1500B (DF) 13.0ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a09:ab81::1	0.3ms	0%*	AS60733	PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2	sox-pn.sox.rs 2001:7f8:1e:8::3a	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:1e:8::3d	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
4	2a02:2d8:0:a00e:232a	12.8ms	0%	-
5	wien1.aco.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:1:1:0:1853	13.2ms	0%	-	NA
6	raphtalia.technikum-wien.at 2001:67c:1790::1	11.1ms	0%	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

tracepath -6

 1?: [LOCALHOST]                        0.019ms pmtu 1500
 1:  _gateway                                             13.853ms 
 1:  _gateway                                              5.797ms 
 2:  sox-pn.sox.rs                                         0.371ms 
 3:  2001:7f8:1e:8::3d                                     0.720ms asymm  2 
 4:  ae8-930.RT.IRX.VIE.AT.retn.net                       13.716ms asymm  3 
 5:  wien21.aco.net                                       11.234ms asymm  3 
 6:  raphtalia.technikum-wien.at                          13.268ms reached
     Resume: pmtu 1500 hops 6 back 4

From DE host (Berlin) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 17.9ms

4/4

Echo 1500B (DF) 17.8ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-13-178.gw01.ber01.as59645.net 2a06:d1c1:100:b::1	0.3ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.5ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-40.cr10.muc02.lwlcom.net 2a00:c380:b200:230::178	11.2ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-10.cr10.muc01.lwlcom.net 2a00:c380:b200:230::177	11.4ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	wien1.aco.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:1:1:0:1853	17.1ms	0%	-	NA
6	2001:628:1101:1014::1	17.7ms	0%	AS1853	ACOnet - ACONET, AT
7	raphtalia.technikum-wien.at 2001:67c:1790::1	17.8ms	0%	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

tracepath -6

 1?: [LOCALHOST]                        0.024ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.464ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.421ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.031ms 
 3:  ae0-40.cr10.muc02.lwlcom.net                         11.744ms 
 4:  ae0-10.cr10.muc01.lwlcom.net                         11.590ms 
 5:  wien1.aco.net                                        17.748ms 
 6:  2001:628:1101:1014::1                                17.841ms 
 7:  raphtalia.technikum-wien.at                          17.924ms reached
     Resume: pmtu 1500 hops 7 back 7

From DE host (Düsseldorf) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 21.2ms

4/4

Echo 1500B (DF) 21.4ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	xe-0-0-12-142.gw01.dus01.as59645.net 2a06:d1c1:100:d::1	0.5ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-101.cr10.dus02.lwlcom.net 2a06:d1c0::dead:beef:1301	0.4ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-40.cr10.dus05.lwlcom.net 2a00:c380:b200:230::199	0.9ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-90.cr11.dus01.lwlcom.net 2a00:c380:b200:230::222	0.8ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-10.cr10.dus06.lwlcom.net 2a00:c380:b200:230::147	1.1ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae0-40.cr10.fra06.lwlcom.net 2a00:c380:b200:230::21	4.1ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
7	ae0-20.cr10.muc01.lwlcom.net 2a00:c380:b200:230::250	14.6ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
8	wien1.aco.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:1:1:0:1853	20.2ms	0%	-	NA
9	2001:628:1101:1014::1	20.8ms	0%	AS1853	ACOnet - ACONET, AT
10	raphtalia.technikum-wien.at 2001:67c:1790::1	21.2ms	0%	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.389ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.401ms 
 2:  ae0-101.cr10.dus02.lwlcom.net                         0.681ms 
 3:  ae0-40.cr10.dus05.lwlcom.net                          0.373ms 
 4:  ae0-20.cr10.vel01.lwlcom.net                          1.312ms 
 5:  ae0-10.cr10.dus06.lwlcom.net                          0.889ms 
 6:  ae0-40.cr10.fra06.lwlcom.net                          3.963ms 
 7:  ae0-20.cr10.muc01.lwlcom.net                         14.955ms asymm  5 
 8:  wien1.aco.net                                        20.367ms asymm  6 
 9:  2001:628:1101:1014::1                                20.681ms asymm  7 
10:  raphtalia.technikum-wien.at                          20.718ms reached
     Resume: pmtu 1500 hops 10 back 8

From NL host (go6lab) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 39.1ms

4/4

Echo 1500B (DF) 39.8ms

yes

Type 1 dest-unreach

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	2a00:8642:42::2	2.3ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	gw.friends.steffann.nl 2a00:8642:1000:f000::1	2.8ms	0%*	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
3	2a00:1ca8:1::194	5.4ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	3.7ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2001:b28:3ff::1b1b:0:1	29.0ms	0%	AS31500	GNM-AS - Global Network Management Inc, AG
6	be9.core4.fra1.he.net 2001:470:e:e9::1	28.4ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	be8.core1.prg1.he.net 2001:470:e:1e::2	39.5ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	be3.core1.vie1.he.net 2001:470:e:a7::2	41.5ms	10%	AS6939	HURRICANE - Hurricane Electric LLC, US
9	2001:470:2dd::2	38.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
10	raphtalia.technikum-wien.at 2001:67c:1790::1	39.1ms	0%	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

Rate-limited ICMPv6: hop 8 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.020ms pmtu 1500
 1:  2a00:8642:42::2                                       2.572ms 
 1:  2a00:8642:42::2                                       2.410ms 
 2:  no reply
 3:  2a00:1ca8:1::194                                      6.419ms 
 4:  2a03:3f40::10:41                                      4.637ms 
 5:  2001:b28:3ff::1b1b:0:1                               29.911ms 
 6:  be6.core4.fra1.he.net                                29.713ms asymm  4 
 7:  be8.core1.prg1.he.net                                37.451ms asymm  5 
 8:  be3.core1.vie1.he.net                                43.077ms asymm  6 
 9:  2001:470:2dd::2                                      38.296ms asymm  7 
10:  raphtalia.technikum-wien.at                          38.510ms reached
     Resume: pmtu 1500 hops 10 back 8

From ITA host (Karsolink) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 16.3ms

3/4

Echo 1500B (DF) 16.4ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	0%*	-
2	2a12:d8c0:109f:121::a1	0.3ms	0%*	AS204471	KARSOLINK - 2S Computers SRL, IT
3	2a12:d8c0:101f:103::1	65.2ms	20%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	*	-	-	-
5	100ge0-0-0-20.core1.vie1.he.net 2001:470:0:414::1	29.8ms	20%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:470:2dd::2	71.2ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	raphtalia.technikum-wien.at 2001:67c:1790::1	15.5ms	0%	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

Rate-limited ICMPv6: hop 3, hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.030ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.583ms 
 1:  karsolink-01.net.karsolink.com                        0.750ms 
 2:  2a12:d8c0:109f:121::a1                                0.837ms 
 3:  2a12:d8c0:101f:6::1                                  10.175ms 
 4:  no reply
 5:  100ge0-0-0-20.core1.vie1.he.net                      21.170ms 
 6:  2001:470:2dd::2                                      16.545ms 
 7:  raphtalia.technikum-wien.at                          16.133ms reached
     Resume: pmtu 1500 hops 7 back 7

From SLO host (6connect) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 8.9ms

4/4

Echo 1500B (DF) 9.0ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	fw1-lju.6connect.com 2607:fae0:a000::2	0.4ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	*	-	-	-
4	2a00:ee0:1:10::2	1.0ms	0%	AS5603	SIOL-NET - Telekom Slovenije, d.d., SI
5	2a11:4142:2002	1.1ms	0%	-
6	r2-vie1-at.as5405.net 2a11:4140::1e	7.4ms	0%	AS5405	INTERDOTLINK - Inter.link GmbH, DE
7	et9-4096.r2-vie2-at.as5405.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:3:1:2:5291	7.4ms	0%	-	NA
8	wien1.aco.net @VIX / AAIX / SAIX / TIROL-IX / ERA-IX 2001:7f8:30:0:1:1:0:1853	9.1ms	0%	-	NA
9	raphtalia.technikum-wien.at 2001:67c:1790::1	8.2ms	0%	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

tracepath -6

 1?: [LOCALHOST]                        0.032ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.668ms 
 1:  fw1-lju.6connect.com                                  0.548ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:10::2                                      1.694ms asymm  3 
 5:  2a00:ee0:1:10::2                                      1.800ms pmtu 1500
 5:  2a11:4142:2002::                                      1.239ms asymm  6 
 6:  r2-vie1-at.as5405.net                                 7.461ms asymm  9 
 7:  et9-4096.r2-vie2-at.as5405.net                        7.519ms asymm  8 
 8:  wien21.aco.net                                        8.093ms asymm  4 
 9:  raphtalia.technikum-wien.at                           8.567ms reached
     Resume: pmtu 1500 hops 9 back 6

From SLO host (T-2) openRFC 4890 ✓

filter likely at: (none) · min PMTU on path: 1500

4/4

Echo small (56B) 10.0ms

4/4

Echo 1500B (DF) 9.0ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	2a01:260:1::225	3.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
3	2a01-260-1-1--9a.core6.t-2.net 2a01:260:1:1::9a	3.0ms	0%*	AS34779	T-2-AS - T-2, d.o.o., SI
4	*	-	-	-
5	*	-	0%	-
6	2001:470:2dd::2	9.6ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
7	2001:470:2dd::2	9.1ms	0%	AS6939	HURRICANE - Hurricane Electric LLC, US
8	raphtalia.technikum-wien.at 2001:67c:1790::1	10.1ms	-	AS51350	TECHNIKUM-WIEN-AS - Fachhochschule Technikum Wien, AT

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       8.964ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.905ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        2.987ms asymm  3 
 5:  100ge0-0-0-31.core1.vie1.he.net                      11.471ms 
 6:  100ge0-0-0-31.core1.vie1.he.net                      10.937ms asymm  5 
 7:  raphtalia.technikum-wien.at                           9.762ms reached
     Resume: pmtu 1500 hops 7 back 6