AS35339 CZ-AS AtNOC GmbH

AS overview

Test target: 2a02:b18:500:a515::1001 · dns1.akis.at · address space: mixed · prefixes announced: 2

prefix(es): 2a02:b18::/32, 2001:67c:1974::/48

Targets & per-vantage-point probe results (7 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
`2a02:b18:500:912:95:129:200:10` webmail.akis.at	whois	✓	✓	refused	open	✓	✓	✓	refused	open	✓	✓	✓	refused	open	✓	✓	✓	?	open	✓	✓	✓	refused	open	✓	✓	✓	refused	open	✓	✓	✓	refused	open	✓
`2a02:b18:500:916:95:129:200:38` atnoc.net	drv	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	-
`2a02:b18:500:916:95:129:200:41` akis.at	whois	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓	✓	✓	open	open	✓
`2a02:b18:500:a515::1001` dns1.akis.at	NS	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	?	?	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓
`2a02:b18:500:a515::f452` mx.akis.at	MX	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	?	?	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓	✓	✓	refused	refused	✓
`2a02:b18:500:a515::f453` mail.akis.at	whois	✓	✓	refused	open	✓	✓	✓	refused	open	✓	✓	✓	refused	open	✓	✓	✓	?	open	✓	✓	✓	refused	open	✓	✓	✓	refused	open	✓	✓	✓	refused	open	✓
`2a02:b18:500:a515::f455` smtp.akis.at	SPF	✓	✓	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), ITA host (Karsolink), SLO host (6connect) - reached via an VIX / AAIX / SAIX / TIROL-IX / ERA-IX-resident transit operator.

RPKI & ASPA

0 of 2 prefix(es) covered by a valid ROA, 2 not-found.

Prefix	RPKI state	Reason	Covering VRP(s)
`2a02:b18::/32`	- not-found	no covering VRP
`2001:67c:1974::/48`	- not-found	no covering VRP

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

At least one router inside AS35339's announced prefix replied during the random-target probe. Hop(s): 2a02:b18:500:bab0::117, 2a02:b18:c053:1010::4. 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 2026-09-22T13:54:20Z

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) 11.3ms

4/4

Echo 1500B (DF) 11.4ms

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	2001:7f8:1e::4	0.4ms	0%	AS13004	SOX - Serbian Open Exchange DOO, RS
3	2001:7f8:30:0:1:1:3:5339 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX	11.2ms	0%	-	NA
4	2a02:b18:c053:1010::4	12.6ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
5	2a02:b18:500:bab0::117	13.6ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
6	dns1.akis.at 2a02:b18:500:a515::1001	12.8ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

tracepath -6

 1?: [LOCALHOST]                        0.022ms pmtu 1500
 1:  _gateway                                              0.885ms 
 1:  _gateway                                              0.979ms 
 2:  2001:7f8:1e::4                                        1.962ms 
 3:  2001:7f8:30:0:1:1:3:5339                             13.530ms 
 4:  2a02:b18:c053:1010::4                                13.451ms 
 5:  2a02:b18:500:bab0::117                               14.154ms 
 6:  dns1.akis.at                                         11.903ms reached
     Resume: pmtu 1500 hops 6 back 6

From DE host (Berlin) openRFC 4890 ✓

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

4/4

Echo small (56B) 17.2ms

4/4

Echo 1500B (DF) 17.3ms

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	0.2ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
2	ae0-2453.cr10.ber01.lwlcom.net 2a06:d1c0::dead:beef:1c02	0.7ms	0%*	AS59645	WYBT-NET - Tobias Fiebig, DE
3	ae0-40.cr10.muc02.lwlcom.net 2a00:c380:b200:230::178	11.4ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-10.cr10.muc01.lwlcom.net 2a00:c380:b200:230::177	11.5ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	2001:7f8:30:0:1:1:3:5339 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX	18.0ms	0%	-	NA
6	2a02:b18:c053:1010::4	17.2ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
7	2a02:b18:500:bab0::117	18.3ms	10%	AS35339	CZ-AS - AtNOC GmbH, AT
8	dns1.akis.at 2a02:b18:500:a515::1001	17.1ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

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

tracepath -6

 1?: [LOCALHOST]                        0.040ms pmtu 1500
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.869ms 
 1:  xe-0-0-13-178.gw01.ber01.as59645.net                  0.704ms 
 2:  ae0-2453.cr10.ber01.lwlcom.net                        1.154ms 
 3:  ae0-40.cr10.muc02.lwlcom.net                         11.775ms 
 4:  ae0-10.cr10.muc01.lwlcom.net                         12.604ms 
 5:  2001:7f8:30:0:1:1:3:5339                             18.009ms 
 6:  ???                                                  17.796ms 
 7:  2a02:b18:500:bab0::117                               18.577ms 
 8:  dns1.akis.at                                         17.618ms reached
     Resume: pmtu 1500 hops 8 back 8

From DE host (Düsseldorf) openRFC 4890 ✓

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

4/4

Echo small (56B) 20.1ms

4/4

Echo 1500B (DF) 20.2ms

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	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	0.4ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
4	ae0-20.cr10.vel01.lwlcom.net 2a00:c380:b200:230::65	1.1ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
5	ae0-30.cr10.dus06.lwlcom.net 2a00:c380:b200:230::36	0.9ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
6	ae0-40.cr10.fra06.lwlcom.net 2a00:c380:b200:230::21	4.3ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
7	ae0-20.cr10.muc01.lwlcom.net 2a00:c380:b200:230::250	14.7ms	0%	AS50629	LWLCOM - LWLcom GmbH, DE
8	2001:7f8:30:0:1:1:3:5339 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX	20.5ms	0%	-	NA
9	2a02:b18:c053:1010::4	20.4ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
10	2a02:b18:500:bab0::117	21.2ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
11	dns1.akis.at 2a02:b18:500:a515::1001	20.3ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

tracepath -6

 1?: [LOCALHOST]                        0.019ms pmtu 1500
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.514ms 
 1:  xe-0-0-12-142.gw01.dus01.as59645.net                  0.285ms 
 2:  ae0-101.cr10.dus02.lwlcom.net                         0.492ms 
 3:  ae0-20.cr10.dus01.lwlcom.net                          0.639ms 
 4:  ae0-90.cr11.dus01.lwlcom.net                          8.043ms 
 5:  ae0-10.cr10.dus06.lwlcom.net                          0.778ms 
 6:  ae0-40.cr10.fra06.lwlcom.net                          4.371ms 
 7:  ae0-20.cr10.muc01.lwlcom.net                         14.313ms asymm  5 
 8:  2001:7f8:30:0:1:1:3:5339                             20.706ms asymm  6 
 9:  ???                                                  20.359ms asymm  7 
10:  2a02:b18:500:bab0::117                               21.135ms asymm  8 
11:  dns1.akis.at                                         20.851ms reached
     Resume: pmtu 1500 hops 11 back 9

From NL host (go6lab) openRFC 4890 ✓

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

4/4

Echo small (56B) 23.1ms

4/4

Echo 1500B (DF) 24.1ms

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	1.9ms	0%	AS203993	GNA-DC1-AS - S.J.M. Steffann, NL
2	*	-	0%*	-
3	2a00:1ca8:1::194	9.1ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
4	2a03:3f40::10:41	7.5ms	0%	AS50673	Serverius-as - Serverius Holding B.V., NL
5	2001:978:2:40::3:1	8.9ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
6	be3458.ccr42.ams03.atlas.cogentco.com 2001:550:0:1000::9a36:27b9	6.2ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
7	be3343.ccr41.fra05.atlas.cogentco.com 2001:550:0:1000::9a36:3e8d	15.0ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
8	be7944.ccr22.muc03.atlas.cogentco.com 2001:550:0:1000::9a36:4b61	24.2ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
9	be9456.ccr82.vie01.atlas.cogentco.com 2001:550:0:1000::9a36:3f8d	22.7ms	30%	AS174	COGENT-174 - Cogent Communications, LLC, US
10	be3935.agr61.vie01.atlas.cogentco.com 2001:550:0:1000::9a36:274e	23.0ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
11	be2862.rcr61.b015975-1.vie01.atlas.cogentco.com 2001:550:0:1000::8275:31a2	25.6ms	0%	AS174	COGENT-174 - Cogent Communications, LLC, US
12	2a02:b18:c053:1010::4	24.0ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
13	2a02:b18:500:bab0::117	24.1ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
14	dns1.akis.at 2a02:b18:500:a515::1001	22.6ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

Rate-limited ICMPv6: hop 9 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.059ms pmtu 1500
 1:  2a00:8642:42::2                                       2.625ms 
 1:  2a00:8642:42::2                                       1.886ms 
 2:  gw.friends.steffann.nl                                4.133ms 
 3:  2a00:1ca8:1::194                                      3.517ms 
 4:  2a03:3f40::10:41                                      7.652ms 
 5:  2001:978:2:40::3:1                                    4.454ms 
 6:  be3458.ccr42.ams03.atlas.cogentco.com                 9.537ms 
 7:  be3343.ccr41.fra05.atlas.cogentco.com                19.512ms 
 8:  be5516.ccr21.muc03.atlas.cogentco.com                18.588ms 
 9:  be5456.ccr81.vie01.atlas.cogentco.com                36.540ms 
10:  be3935.agr61.vie01.atlas.cogentco.com                27.990ms 
11:  be2949.rcr61.b015975-1.vie01.atlas.cogentco.com      22.970ms 
12:  2a02:b18:c053:1010::4                                22.758ms asymm  8 
13:  2a02:b18:500:bab0::117                               26.449ms asymm  9 
14:  dns1.akis.at                                         25.222ms reached
     Resume: pmtu 1500 hops 14 back 10

From ITA host (Karsolink) openRFC 4890 ✓

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

4/4

Echo small (56B) 35.1ms

3/4

Echo 1500B (DF) 11.8ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	*	-	-	-
3	2a12:d8c0:109f:106::a2	3.1ms	50%	AS204471	KARSOLINK - 2S Computers SRL, IT
4	2a02:2d8:4:1815:232a	3.3ms	0%	-
5	RT.IRX.VIE.AT.retn.net 2a02:2d8::57f5:e0af	15.4ms	0%	AS9002	RETN-AS - RETN Limited, GB
6	2001:7f8:30:0:1:1:3:5339 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX	11.4ms	0%	-	NA
7	2a02:b18:c053:1010::4	11.3ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
8	2a02:b18:500:bab0::117	16.2ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
9	dns1.akis.at 2a02:b18:500:a515::1001	11.6ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

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

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  no reply
 2:  2a12:d8c0:109f:121::a1                                0.726ms 
 3:  2a12:d8c0:109f:106::a2                                3.648ms 
 4:  ae8-202.RT.CLR.MIL.IT.retn.net                        7.927ms asymm  5 
 5:  RT.IRX.VIE.AT.retn.net                               15.854ms 
 6:  2001:7f8:30:0:1:1:3:5339                             11.930ms 
 7:  ???                                                  11.818ms 
 8:  2a02:b18:500:bab0::117                               16.788ms 
 9:  dns1.akis.at                                         11.898ms reached
     Resume: pmtu 1500 hops 9 back 9

From SLO host (6connect) openRFC 4890 ✓

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

4/4

Echo small (56B) 7.8ms

4/4

Echo 1500B (DF) 8.1ms

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	0.2ms	0%*	AS8038	6CONNECT - 6connect, Inc., US
2	*	-	-	-
3	*	-	0%	-
4	*	-	60%	-
5	100ge0-0-0-5.core1.vie1.he.net 2001:470:0:578::1	7.5ms	20%	AS6939	HURRICANE - Hurricane Electric LLC, US
6	2001:7f8:30:0:1:1:3:5339 @VIX / AAIX / SAIX / TIROL-IX / ERA-IX	7.4ms	0%	-	NA
7	2a02:b18:c053:1010::4	7.0ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
8	2a02:b18:500:bab0::117	9.2ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT
9	dns1.akis.at 2a02:b18:500:a515::1001	8.1ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

Rate-limited ICMPv6: hop 4, hop 5 (loss between 5% and 95% across mtr cycles - the router replies but only sometimes).

tracepath -6

 1?: [LOCALHOST]                        0.016ms pmtu 9000
 1:  fw1-lju.6connect.com                                  0.569ms 
 1:  fw1-lju.6connect.com                                  0.561ms 
 2:  no reply
 3:  2a03:a100:0:201:1::1                                  0.987ms 
 4:  2a03:a100:0:201:1::1                                  1.067ms pmtu 1500
 4:  e0-1.core1.lju1.he.net                                2.383ms 
 5:  100ge0-0-0-5.core1.vie1.he.net                        9.864ms 
 6:  2001:7f8:30:0:1:1:3:5339                              7.421ms asymm  4 
 7:  ???                                                   7.815ms asymm  5 
 8:  2a02:b18:500:bab0::117                                8.986ms asymm  7 
 9:  dns1.akis.at                                          8.177ms reached
     Resume: pmtu 1500 hops 9 back 7

From SLO host (T-2) openRFC 4890 ✓

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

4/4

Echo small (56B) 8.7ms

4/4

Echo 1500B (DF) 9.9ms

yes

Type 1 dest-unreach

443,80

TCP responds on

Path (traceroute + mtr + PTR)

#	IP / PTR	RTT	mtr loss	AS	AS holder
1	*	-	-	-
2	*	-	0%*	-
3	*	-	0%*	-
4	*	-	0%*	-
5	*	-	0%*	-
6	*	-	0%	-
7	*	-	0%	-
8	*	-	0%	-
9	dns1.akis.at 2a02:b18:500:a515::1001	8.2ms	0%	AS35339	CZ-AS - AtNOC GmbH, AT

tracepath -6

 1?: [LOCALHOST]                        0.028ms pmtu 1500
 1:  2a01:261:313:b814::1                                  1.460ms 
 2:  2a01:260:1::225                                       9.105ms 
 3:  2a01-260-1-1--9a.core6.t-2.net                        3.621ms 
 4:  2a01-260-1-1--c.core6.t-2.net                         5.081ms 
 5:  2a01-260-1-1--2a.core6.t-2.net                        4.819ms asymm  4 
 6:  2a02:b18:c053:1010::4                                 9.528ms 
 7:  2a02:b18:500:bab0::117                                9.223ms 
 8:  dns1.akis.at                                          8.772ms reached
     Resume: pmtu 1500 hops 8 back 8