AS61201 - HTBLA-KLU-AS Hohere technische Bundeslehranstalt KlagenfurtPI/PARFC 4890 ✓RPKI ✓ 1/1ASPA -

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AS overview

Test target: 2a00:eb0:100::1 · static prefix probe · address space: mixed · prefixes announced: 1

prefix(es): 2a00:eb0:100::/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 / hostnameSourceSRB host (SOX, Belgrade)DE host (Berlin)DE host (Düsseldorf)NL host (go6lab)ITA host (Karsolink)SLO host (6connect)SLO host (T-2)
ping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reachedping1500B:80:443reached
2a00:eb0:100::1prb??-??-??-??-??-??-??-

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 SLO host (T-2) - reached via an VIX / AAIX / SAIX / TIROL-IX / ERA-IX-resident transit operator.

RPKI & ASPA

1 of 1 prefix(es) covered by a valid ROA.

PrefixRPKI stateReasonCovering VRP(s)
2a00:eb0:100::/48✓ validmatched VRP (correct origin, length within maxLength)AS61201 /48 maxLen 48 (ripe); AS39912 /32 maxLen 32 (ripe)

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

At least one router inside AS61201's announced prefix replied during the random-target probe. Hop(s): 2a00:eb0:100:815::20. 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 2026-09-22T13:52:22Z

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 ↗

multi-vantage path diagram for AS61201

From SRB host (SOX, Belgrade)   openRFC 4890 ✓

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

4/4
Echo small (56B) 50.4ms
4/4
Echo 1500B (DF) 50.4ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a09:ab81::10.3ms0%*AS60733PERKE-NET - ZORAN PEROVIC trading as Agencija Perke.NET, RS
2sox-pn.sox.rs
2001:7f8:1e:8::3a
0.4ms0%AS13004SOX - Serbian Open Exchange DOO, RS
32001:7f8:1e:8::3d0.6ms0%AS13004SOX - Serbian Open Exchange DOO, RS
42001:67c:128c::69922.7ms0%-NA
5hu0-15-0-0.lontr4.London.opentransit.net
2001:688:0:2::c3
39.9ms0%AS5511Opentransit - Orange S.A., FR
6*---
7be4.core2.ams2.he.net
2001:470:0:293::2
42.7ms0%AS6939HURRICANE - Hurricane Electric LLC, US
8be1.core2.fra2.he.net
2001:470:e:43::2
41.9ms50%AS6939HURRICANE - Hurricane Electric LLC, US
9be3.core4.fra1.he.net
2001:470:e:5a::2
41.7ms-AS6939HURRICANE - Hurricane Electric LLC, US
10*---
11m204-1.ix2.ffm.de.as39912.net
2001:7f8::9be8:0:1
43.0ms0%-NA
12m204-1.uni.vie.at.as39912.net
2a01:f8:666:121:81:94:57:3
41.4ms0%AS39912i3B-AS - oja.at GmbH, AT
132a01:f8:1:2:1:1:114:650.1ms0%AS39912i3B-AS - oja.at GmbH, AT
14*-0%-
15*-0%-
16*---
17*---
18*---
19*---
20*---

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

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 1500
 1:  _gateway                                              0.629ms 
 1:  _gateway                                              0.485ms 
 2:  sox-pn.sox.rs                                         0.871ms 
 3:  2001:7f8:1e:8::3d                                     0.495ms asymm  2 
 4:  2001:67c:128c::699                                   23.548ms asymm  5 
 5:  hu0-15-0-0.lontr4.London.opentransit.net             39.971ms asymm  6 
 6:  no reply
 7:  be4.core2.ams2.he.net                                41.376ms 
 8:  be1.core2.fra2.he.net                                44.117ms asymm  6 
 9:  no reply
10:  no reply
11:  m204-1.ix2.ffm.de.as39912.net                        41.488ms asymm  4 
12:  m204-1.uni.vie.at.as39912.net                        41.602ms asymm  3 
13:  2a01:f8:1:2:1:1:114:6                                50.324ms asymm  4 
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From DE host (Berlin)   openRFC 4890 ✓

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

4/4
Echo small (56B) 29.8ms
4/4
Echo 1500B (DF) 29.8ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-13-178.gw01.ber01.as59645.net
2a06:d1c1:100:b::1
0.3ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ae0-2453.cr10.ber01.lwlcom.net
2a06:d1c0::dead:beef:1c02
0.7ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
3ae3-90.cr10.ham01.lwlcom.net
2a00:c380:b200:230::192
5.0ms0%AS50629LWLCOM - LWLcom GmbH, DE
4ae0-50.cr11.ham01.lwlcom.net
2a00:c380:b200:230::45
5.1ms0%AS50629LWLCOM - LWLcom GmbH, DE
52a00:c380:f000::4b5.3ms0%AS50629LWLCOM - LWLcom GmbH, DE
6ae4-2087.dus10.core-backbone.com
2a01:4a0:0:2087::33
11.3ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
7ae21-2071.fra10.core-backbone.com
2a01:4a0:0:2071::4
10.7ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
8ae2-2021.fra20.core-backbone.com
2a01:4a0:0:2021::4
10.8ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
9ae6-2003.nbg20.core-backbone.com
2a01:4a0:0:2003::2
12.0ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
10ae2-2032.muc20.core-backbone.com
2a01:4a0:0:2032::7
14.5ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
11ae4-2057.slz10.core-backbone.com
2a01:4a0:0:2057::8
16.3ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
12ae2-2058.vie20.core-backbone.com
2a01:4a0:0:2058::16
20.1ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
132a01:4a0:1338:83::220.8ms0%AS201011CORE-BACKBONE - Core-Backbone GmbH, DE
142a01:f8:1:2:1:1:114:629.5ms0%AS39912i3B-AS - oja.at GmbH, AT
15*-0%-
16*-0%-
17*---
18*---
19*---
20*---

tracepath -6

 1?: [LOCALHOST]                        0.026ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.490ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.570ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        0.836ms 
 3:  ae3-90.cr10.ham01.lwlcom.net                          5.109ms 
 4:  ae0-50.cr11.ham01.lwlcom.net                          5.181ms 
 5:  2a00:c380:f000::4b                                    5.474ms asymm  4 
 6:  ae4-2087.dus10.core-backbone.com                     11.621ms asymm  5 
 7:  ae21-2071.fra10.core-backbone.com                    11.087ms asymm  5 
 8:  ae2-2021.fra20.core-backbone.com                     10.904ms asymm  4 
 9:  ae6-2003.nbg20.core-backbone.com                     12.393ms asymm  6 
10:  ae2-2032.muc20.core-backbone.com                     15.195ms asymm  7 
11:  ae4-2057.slz10.core-backbone.com                     16.836ms asymm  8 
12:  ae2-2058.vie20.core-backbone.com                     21.536ms asymm  9 
13:  2a01:4a0:1338:83::2                                  21.294ms asymm  5 
14:  2a01:f8:1:2:1:1:114:6                                29.997ms asymm  6 
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From DE host (Düsseldorf)   openRFC 4890 ✓

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

4/4
Echo small (56B) 29.4ms
4/4
Echo 1500B (DF) 29.4ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1xe-0-0-12-142.gw01.dus01.as59645.net
2a06:d1c1:100:d::1
0.2ms0%*AS59645WYBT-NET - Tobias Fiebig, DE
2ipv6.decix-dusseldorf.core1.dus1.he.net
2001:7f8:9e::1b1b:0:1
5.9ms0%-NA
3100ge0-0-0-18.core4.fra1.he.net
2001:470:0:52e::1
7.5ms50%AS6939HURRICANE - Hurricane Electric LLC, US
4*---
5m204-1.ix2.ffm.de.as39912.net
2001:7f8::9be8:0:1
4.6ms0%-NA
6m204-1.uni.vie.at.as39912.net
2a01:f8:666:121:81:94:57:3
20.4ms0%AS39912i3B-AS - oja.at GmbH, AT
72a01:f8:1:2:1:1:114:630.2ms0%AS39912i3B-AS - oja.at GmbH, AT
8*-0%-
9*-0%-
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---

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

tracepath -6

 1?: [LOCALHOST]                        0.027ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.386ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.259ms 
 2:  ipv6.decix-dusseldorf.core1.dus1.he.net               6.733ms asymm  3 
 3:  100ge0-0-0-18.core4.fra1.he.net                       6.083ms asymm  4 
 4:  no reply
 5:  m204-1.ix2.ffm.de.as39912.net                         4.862ms asymm  3 
 6:  m204-1.uni.vie.at.as39912.net                        20.764ms 
 7:  2a01:f8:1:2:1:1:114:6                                30.191ms 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From NL host (go6lab)   openRFC 4890 ✓

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

4/4
Echo small (56B) 32.3ms
3/4
Echo 1500B (DF) 33.9ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
12a00:8642:42::21.0ms0%AS203993GNA-DC1-AS - S.J.M. Steffann, NL
2gw.friends.steffann.nl
2a00:8642:1000:f000::1
9.9ms0%*AS203993GNA-DC1-AS - S.J.M. Steffann, NL
32a00:1ca8:1::1949.9ms10%AS50673Serverius-as - Serverius Holding B.V., NL
42a03:3f40::10:3310.7ms0%AS50673Serverius-as - Serverius Holding B.V., NL
5ams-ix.retn.net
2001:7f8:1::a500:9002:1
11.3ms0%-NA
6RT.IRX.VIE.AT.retn.net
2a02:2d8::57f5:e0af
26.4ms10%AS9002RETN-AS - RETN Limited, GB
7GW-AS8075.retn.net
2a02:2d8:0:a008:232a::1
29.2ms0%AS9002RETN-AS - RETN Limited, GB
82a0b:6c40:3:98:185:211:219:16326.4ms0%AS8540AMANET-AS - AMA netwoRX GmbH, AT
92a01:f8:1:2:1:1:114:639.0ms0%AS39912i3B-AS - oja.at GmbH, AT
10*-0%-
11*-0%-
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---

Rate-limited ICMPv6: hop 3, hop 6 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.038ms pmtu 1500
 1:  2a00:8642:42::2                                       5.094ms 
 1:  2a00:8642:42::2                                       2.418ms 
 2:  gw.friends.steffann.nl                                3.271ms 
 3:  2a00:1ca8:1::194                                      8.176ms 
 4:  2a03:3f40::10:33                                      8.999ms 
 5:  ams-ix.retn.net                                       8.975ms asymm  7 
 6:  RT.IRX.VIE.AT.retn.net                               52.092ms 
 7:  GW-AS8075.retn.net                                   25.244ms asymm  6 
 8:  2a0b:6c40:3:98:185:211:219:163                       23.245ms asymm  7 
 9:  2a01:f8:1:2:1:1:114:6                                33.235ms asymm  8 
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From ITA host (Karsolink)   openRFC 4890 ✓

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

4/4
Echo small (56B) 29.9ms
4/4
Echo 1500B (DF) 30.0ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*---
2*-0%*-
32a12:d8c0:101f:6::19.8ms90%AS204471KARSOLINK - 2S Computers SRL, IT
4*---
5be47.core1.mil2.he.net
2001:470:e:69::2
13.1ms0%AS6939HURRICANE - Hurricane Electric LLC, US
6be1.core1.zrh2.he.net
2001:470:e:dd::2
14.5ms0%AS6939HURRICANE - Hurricane Electric LLC, US
7*-10%-
8*---
9*---
10m204-1.uni.vie.at.as39912.net
2a01:f8:666:121:81:94:57:3
20.3ms0%AS39912i3B-AS - oja.at GmbH, AT
112a01:f8:1:2:1:1:114:629.8ms0%AS39912i3B-AS - oja.at GmbH, AT
12*-0%-
13*-0%-
14*---
15*---
16*---
17*---
18*---
19*---
20*---

Rate-limited ICMPv6: hop 3, hop 7 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.031ms pmtu 1500
 1:  karsolink-01.net.karsolink.com                        0.960ms 
 1:  karsolink-01.net.karsolink.com                        0.627ms 
 2:  2a12:d8c0:109f:121::a1                                0.645ms 
 3:  2a12:d8c0:101f:6::1                                  10.392ms 
 4:  no reply
 5:  be47.core1.mil2.he.net                               12.263ms 
 6:  be1.core1.zrh2.he.net                                16.331ms 
 7:  be10.core4.fra1.he.net                               19.993ms 
 8:  no reply
 9:  no reply
10:  m204-1.uni.vie.at.as39912.net                        20.598ms asymm  6 
11:  2a01:f8:1:2:1:1:114:6                                29.837ms asymm  7 
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500 

From SLO host (6connect)   openRFC 4890 ✓

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

4/4
Echo small (56B) 24.7ms
4/4
Echo 1500B (DF) 24.5ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1fw1-lju.6connect.com
2607:fae0:a000::2
0.5ms0%*AS80386CONNECT - 6connect, Inc., US
2ccr-to-fw-ccr1-gw-lju.6connect.com
2607:fae0:a000:2::2
0.5ms-AS80386CONNECT - 6connect, Inc., US
3*-0%-
42a00:ee0:1:15::21.4ms0%AS5603SIOL-NET - Telekom Slovenije, d.d., SI
5m204-1.ix2.ffm.de.as39912.net
2001:7f8::9be8:0:1
15.8ms0%-NA
6m204-1.uni.vie.at.as39912.net
2a01:f8:666:121:81:94:57:3
15.4ms0%AS39912i3B-AS - oja.at GmbH, AT
72a01:f8:1:2:1:1:114:624.8ms0%AS39912i3B-AS - oja.at GmbH, AT
8*-0%-
9*-0%-
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---

tracepath -6

 1?: [LOCALHOST]                        0.018ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.594ms 
 1:  fw1-lju.6connect.com                                  0.770ms 
 2:  no reply
 3:  no reply
 4:  2a00:ee0:1:15::2                                      1.578ms asymm  3 
 5:  2a00:ee0:1:15::2                                      1.593ms pmtu 1500
 5:  m204-1.ix2.ffm.de.as39912.net                        20.682ms asymm  6 
 6:  m204-1.uni.vie.at.as39912.net                        15.817ms asymm  4 
 7:  2a01:f8:1:2:1:1:114:6                                24.949ms asymm  5 
 8:  no reply
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500

From SLO host (T-2)   openRFC 4890 ✓

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

4/4
Echo small (56B) 18.1ms
4/4
Echo 1500B (DF) 18.1ms
no
Type 1 dest-unreach
-
TCP responds on

Path (traceroute + mtr + PTR)

#IP / PTRRTTmtr lossASAS holder
1*-0%*-
22a01:260:1::2252.4ms0%*AS34779T-2-AS - T-2, d.o.o., SI
32a01-260-1-1--9c.core6.t-2.net
2a01:260:1:1::9c
1.9ms0%*AS34779T-2-AS - T-2, d.o.o., SI
4*---
5100ge0-0-0-31.core1.vie1.he.net
2001:470:0:4a8::1
10.4ms0%AS6939HURRICANE - Hurricane Electric LLC, US
6100ge0-0-0-31.core1.vie1.he.net
2001:470:0:4a8::1
12.6ms0%AS6939HURRICANE - Hurricane Electric LLC, US
72001:7f8:30:0:2:1:3:9912 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX9.7ms0%-NA
8*-0%-
9*-0%-
10*---
11*---
12*---
13*---
14*---
15*---
16*---
17*---
18*---
19*---
20*---

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  no reply
 2:  2a01:260:1::225                                       3.116ms 
 3:  2a01-260-1-1--9c.core6.t-2.net                        2.809ms 
 4:  2a01-260-1-1--38.core6.t-2.net                        1.974ms asymm  3 
 5:  no reply
 6:  2001:7f8:30:0:2:1:3:9912                              9.622ms asymm  5 
 7:  2a01:f8:1:2:1:1:114:6                                19.267ms asymm  6 
 8:  2a01:f8:1:2:1:1:114:6                                20.495ms asymm  6 
 9:  no reply
10:  no reply
11:  no reply
12:  no reply
13:  no reply
14:  no reply
15:  no reply
16:  no reply
17:  no reply
18:  no reply
19:  no reply
20:  no reply
     Too many hops: pmtu 1500
     Resume: pmtu 1500