The Border Gateway Protocol (BGP) is the protocol backing the core routing decisions on the Internet. It maintains a table of IP networks or 'prefixes' which designate network reachability among autonomous systems (AS). It is described as a path vector protocol. BGP does not use traditional Interior Gateway Protocol (IGP) metrics, but makes routing decisions based on path, network policies and/or rulesets. For this reason, it is more appropriately termed a reachability protocol rather than routing protocol.

Monday, September 12, 2011

[bgp-stats] Routing Table Report - Japan view

* BGP Routing Table Analysis Reports *
Routing Table Report 04:00 +10GMT Tue 13 Sep, 2011

Report Website: http://thyme.rand.apnic.net
Detailed Analysis: http://thyme.rand.apnic.net/current/

Analysis Summary
----------------

BGP routing table entries examined: 371424
Prefixes after maximum aggregation: 167546
Deaggregation factor: 2.22
Unique aggregates announced to Internet: 183828
Total ASes present in the Internet Routing Table: 38757
Prefixes per ASN: 9.58
Origin-only ASes present in the Internet Routing Table: 32150
Origin ASes announcing only one prefix: 15460
Transit ASes present in the Internet Routing Table: 5207
Transit-only ASes present in the Internet Routing Table: 136
Average AS path length visible in the Internet Routing Table: 4.3
Max AS path length visible: 36
Max AS path prepend of ASN (22394) 33
Prefixes from unregistered ASNs in the Routing Table: 1213
Unregistered ASNs in the Routing Table: 701
Number of 32-bit ASNs allocated by the RIRs: 1721
Number of 32-bit ASNs visible in the Routing Table: 1400
Prefixes from 32-bit ASNs in the Routing Table: 3224
Special use prefixes present in the Routing Table: 0
Prefixes being announced from unallocated address space: 103
Number of addresses announced to Internet: 2475904512
Equivalent to 147 /8s, 147 /16s and 78 /24s
Percentage of available address space announced: 66.8
Percentage of allocated address space announced: 66.8
Percentage of available address space allocated: 100.0
Percentage of address space in use by end-sites: 91.2
Total number of prefixes smaller than registry allocations: 154638

APNIC Region Analysis Summary
-----------------------------

Prefixes being announced by APNIC Region ASes: 93842
Total APNIC prefixes after maximum aggregation: 30691
APNIC Deaggregation factor: 3.06
Prefixes being announced from the APNIC address blocks: 90390
Unique aggregates announced from the APNIC address blocks: 38121
APNIC Region origin ASes present in the Internet Routing Table: 4562
APNIC Prefixes per ASN: 19.81
APNIC Region origin ASes announcing only one prefix: 1257
APNIC Region transit ASes present in the Internet Routing Table: 712
Average APNIC Region AS path length visible: 4.5
Max APNIC Region AS path length visible: 18
Number of APNIC region 32-bit ASNs visible in the Routing Table: 84
Number of APNIC addresses announced to Internet: 626377568
Equivalent to 37 /8s, 85 /16s and 195 /24s
Percentage of available APNIC address space announced: 79.4

APNIC AS Blocks 4608-4864, 7467-7722, 9216-10239, 17408-18431
(pre-ERX allocations) 23552-24575, 37888-38911, 45056-46079, 55296-56319,
58368-59391, 131072-132095, 132096-133119
APNIC Address Blocks 1/8, 14/8, 27/8, 36/8, 39/8, 42/8, 43/8,
49/8, 58/8, 59/8, 60/8, 61/8, 101/8, 103/8,
106/8, 110/8, 111/8, 112/8, 113/8, 114/8, 115/8,
116/8, 117/8, 118/8, 119/8, 120/8, 121/8, 122/8,
123/8, 124/8, 125/8, 126/8, 133/8, 175/8, 180/8,
182/8, 183/8, 202/8, 203/8, 210/8, 211/8, 218/8,
219/8, 220/8, 221/8, 222/8, 223/8,

ARIN Region Analysis Summary
----------------------------

Prefixes being announced by ARIN Region ASes: 143323
Total ARIN prefixes after maximum aggregation: 73474
ARIN Deaggregation factor: 1.95
Prefixes being announced from the ARIN address blocks: 115130
Unique aggregates announced from the ARIN address blocks: 47258
ARIN Region origin ASes present in the Internet Routing Table: 14642
ARIN Prefixes per ASN: 7.86
ARIN Region origin ASes announcing only one prefix: 5634
ARIN Region transit ASes present in the Internet Routing Table: 1556
Average ARIN Region AS path length visible: 4.0
Max ARIN Region AS path length visible: 36
Number of ARIN region 32-bit ASNs visible in the Routing Table: 12
Number of ARIN addresses announced to Internet: 804855424
Equivalent to 47 /8s, 249 /16s and 30 /24s
Percentage of available ARIN address space announced: 64.0

ARIN AS Blocks 1-1876, 1902-2042, 2044-2046, 2048-2106
(pre-ERX allocations) 2138-2584, 2615-2772, 2823-2829, 2880-3153
3354-4607, 4865-5119, 5632-6655, 6912-7466
7723-8191, 10240-12287, 13312-15359, 16384-17407
18432-20479, 21504-23551, 25600-26591,
26624-27647, 29696-30719, 31744-33791
35840-36863, 39936-40959, 46080-47103
53248-55295, 393216-394239
ARIN Address Blocks 3/8, 4/8, 6/8, 7/8, 8/8, 9/8, 11/8,
12/8, 13/8, 15/8, 16/8, 17/8, 18/8, 19/8,
20/8, 21/8, 22/8, 23/8, 24/8, 26/8, 28/8,
29/8, 30/8, 32/8, 33/8, 34/8, 35/8, 38/8,
40/8, 44/8, 45/8, 47/8, 48/8, 50/8, 52/8,
53/8, 54/8, 55/8, 56/8, 57/8, 63/8, 64/8,
65/8, 66/8, 67/8, 68/8, 69/8, 70/8, 71/8,
72/8, 73/8, 74/8, 75/8, 76/8, 96/8, 97/8,
98/8, 99/8, 100/8, 104/8, 107/8, 108/8, 173/8,
174/8, 184/8, 199/8, 204/8, 205/8, 206/8, 207/8,
208/8, 209/8, 214/8, 215/8, 216/8,

RIPE Region Analysis Summary
----------------------------

Prefixes being announced by RIPE Region ASes: 88018
Total RIPE prefixes after maximum aggregation: 50024
RIPE Deaggregation factor: 1.76
Prefixes being announced from the RIPE address blocks: 81087
Unique aggregates announced from the RIPE address blocks: 53885
RIPE Region origin ASes present in the Internet Routing Table: 15963
RIPE Prefixes per ASN: 5.08
RIPE Region origin ASes announcing only one prefix: 7962
RIPE Region transit ASes present in the Internet Routing Table: 2499
Average RIPE Region AS path length visible: 4.6
Max RIPE Region AS path length visible: 33
Number of RIPE region 32-bit ASNs visible in the Routing Table: 997
Number of RIPE addresses announced to Internet: 488758528
Equivalent to 29 /8s, 33 /16s and 221 /24s
Percentage of available RIPE address space announced: 78.7

RIPE AS Blocks 1877-1901, 2043, 2047, 2107-2136, 2585-2614
(pre-ERX allocations) 2773-2822, 2830-2879, 3154-3353, 5377-5631
6656-6911, 8192-9215, 12288-13311, 15360-16383
20480-21503, 24576-25599, 28672-29695
30720-31743, 33792-35839, 38912-39935
40960-45055, 47104-52223, 56320-58367
196608-198655
RIPE Address Blocks 2/8, 5/8, 25/8, 31/8, 37/8, 46/8, 51/8,
62/8, 77/8, 78/8, 79/8, 80/8, 81/8, 82/8,
83/8, 84/8, 85/8, 86/8, 87/8, 88/8, 89/8,
90/8, 91/8, 92/8, 93/8, 94/8, 95/8, 109/8,
176/8, 178/8, 185/8, 193/8, 194/8, 195/8, 212/8,
213/8, 217/8,

LACNIC Region Analysis Summary
------------------------------

Prefixes being announced by LACNIC Region ASes: 34463
Total LACNIC prefixes after maximum aggregation: 7755
LACNIC Deaggregation factor: 4.44
Prefixes being announced from the LACNIC address blocks: 33767
Unique aggregates announced from the LACNIC address blocks: 17665
LACNIC Region origin ASes present in the Internet Routing Table: 1522
LACNIC Prefixes per ASN: 22.19
LACNIC Region origin ASes announcing only one prefix: 453
LACNIC Region transit ASes present in the Internet Routing Table: 274
Average LACNIC Region AS path length visible: 4.4
Max LACNIC Region AS path length visible: 19
Number of LACNIC region 32-bit ASNs visible in the Routing Table: 303
Number of LACNIC addresses announced to Internet: 88472448
Equivalent to 5 /8s, 69 /16s and 251 /24s
Percentage of available LACNIC address space announced: 58.6

LACNIC AS Blocks 26592-26623, 27648-28671, 52224-53247,
262144-263167 plus ERX transfers
LACNIC Address Blocks 177/8, 179/8, 181/8, 186/8, 187/8, 189/8, 190/8,
200/8, 201/8,

AfriNIC Region Analysis Summary
-------------------------------

Prefixes being announced by AfriNIC Region ASes: 8391
Total AfriNIC prefixes after maximum aggregation: 2028
AfriNIC Deaggregation factor: 4.14
Prefixes being announced from the AfriNIC address blocks: 6490
Unique aggregates announced from the AfriNIC address blocks: 2030
AfriNIC Region origin ASes present in the Internet Routing Table: 484
AfriNIC Prefixes per ASN: 13.41
AfriNIC Region origin ASes announcing only one prefix: 154
AfriNIC Region transit ASes present in the Internet Routing Table: 103
Average AfriNIC Region AS path length visible: 4.6
Max AfriNIC Region AS path length visible: 25
Number of AfriNIC region 32-bit ASNs visible in the Routing Table: 4
Number of AfriNIC addresses announced to Internet: 27328000
Equivalent to 1 /8s, 160 /16s and 254 /24s
Percentage of available AfriNIC address space announced: 40.7

AfriNIC AS Blocks 36864-37887, 327680-328703 & ERX transfers
AfriNIC Address Blocks 41/8, 102/8, 105/8, 197/8,

APNIC Region per AS prefix count summary
----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
4766 2508 11047 955 Korea Telecom (KIX)
17974 2011 516 31 PT TELEKOMUNIKASI INDONESIA
7545 1588 301 83 TPG Internet Pty Ltd
4755 1546 639 170 TATA Communications formerly
7552 1415 1064 7 Vietel Corporation
24560 1178 336 193 Bharti Airtel Ltd., Telemedia
9829 1153 989 28 BSNL National Internet Backbo
9583 1080 80 504 Sify Limited
4808 1077 2093 308 CNCGROUP IP network: China169
17488 982 192 158 Hathway IP Over Cable Interne

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-APNIC

ARIN Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3564 3817 226 bellsouth.net, inc.
18566 1912 364 237 Covad Communications
1785 1822 680 122 PaeTec Communications, Inc.
4323 1624 1085 395 Time Warner Telecom
20115 1592 1541 632 Charter Communications
7029 1588 995 231 Windstream Communications Inc
22773 1452 2906 99 Cox Communications, Inc.
19262 1395 4724 399 Verizon Global Networks
7018 1335 7050 874 AT&T WorldNet Services
30036 1328 244 688 Mediacom Communications Corp

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-ARIN

RIPE Region per AS prefix count summary
---------------------------------------

ASN No of nets /20 equiv MaxAgg Description
34984 547 107 178 BILISIM TELEKOM
6830 526 1811 322 UPC Distribution Services
20940 501 155 389 Akamai Technologies European
3292 472 2080 403 TDC Tele Danmark
12479 468 594 8 Uni2 Autonomous System
8866 460 133 26 Bulgarian Telecommunication C
3320 431 8152 375 Deutsche Telekom AG
29049 424 31 55 AzerSat LLC.
8402 417 352 13 Corbina telecom
8551 403 354 44 Bezeq International

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-RIPE

LACNIC Region per AS prefix count summary
-----------------------------------------

ASN No of nets /20 equiv MaxAgg Description
10620 1661 305 161 TVCABLE BOGOTA
8151 1408 2802 356 UniNet S.A. de C.V.
28573 1308 1003 71 NET Servicos de Comunicao S.A
7303 1051 578 166 Telecom Argentina Stet-France
14420 715 57 88 CORPORACION NACIONAL DE TELEC
6503 584 450 68 AVANTEL, S.A.
22047 579 322 17 VTR PUNTO NET S.A.
27947 565 55 82 Telconet S.A
3816 535 232 98 Empresa Nacional de Telecomun
11172 516 85 91 Servicios Alestra S.A de C.V

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-LACNIC

AfriNIC Region per AS prefix count summary
------------------------------------------

ASN No of nets /20 equiv MaxAgg Description
24863 812 147 43 LINKdotNET AS number
8452 684 445 11 TEDATA
15475 512 74 8 Nile Online
36992 301 415 14 Etisalat MISR
3741 267 938 228 The Internet Solution
6713 242 519 14 Itissalat Al-MAGHRIB
33776 204 13 14 Starcomms Nigeria Limited
15706 195 32 6 Sudatel Internet Exchange Aut
12258 193 28 62 Vodacom Internet Company
29571 191 17 11 Ci Telecom Autonomous system

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet-AFRINIC

Global Per AS prefix count summary
----------------------------------

ASN No of nets /20 equiv MaxAgg Description
6389 3564 3817 226 bellsouth.net, inc.
23456 3224 764 1744 32-bit ASN transition
4766 2508 11047 955 Korea Telecom (KIX)
17974 2011 516 31 PT TELEKOMUNIKASI INDONESIA
18566 1912 364 237 Covad Communications
1785 1822 680 122 PaeTec Communications, Inc.
10620 1661 305 161 TVCABLE BOGOTA
4323 1624 1085 395 Time Warner Telecom
20115 1592 1541 632 Charter Communications
7029 1588 995 231 Windstream Communications Inc

Complete listing at http://thyme.rand.apnic.net/current/data-ASnet

Global Per AS Maximum Aggr summary
----------------------------------

ASN No of nets Net Savings Description
17974 2011 1980 PT TELEKOMUNIKASI INDONESIA
1785 1822 1700 PaeTec Communications, Inc.
18566 1912 1675 Covad Communications
4766 2508 1553 Korea Telecom (KIX)
7545 1588 1505 TPG Internet Pty Ltd
10620 1661 1500 TVCABLE BOGOTA
23456 3224 1480 32-bit ASN transition
7552 1415 1408 Vietel Corporation
4755 1546 1376 TATA Communications formerly
7029 1588 1357 Windstream Communications Inc

Complete listing at http://thyme.rand.apnic.net/current/data-CIDRnet

List of Unregistered Origin ASNs (Global)
-----------------------------------------

Bad AS Designation Network Transit AS Description
15132 UNALLOCATED 12.9.150.0/24 7018 AT&T WorldNet Servic
32567 UNALLOCATED 12.14.170.0/24 4323 Time Warner Telecom
32567 UNALLOCATED 12.25.107.0/24 4323 Time Warner Telecom
26973 UNALLOCATED 12.39.152.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.154.0/23 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.155.0/24 7018 AT&T WorldNet Servic
26973 UNALLOCATED 12.39.159.0/24 7018 AT&T WorldNet Servic
25639 UNALLOCATED 12.41.169.0/24 7018 AT&T WorldNet Servic
13317 UNALLOCATED 12.44.10.0/24 7018 AT&T WorldNet Servic
23502 UNALLOCATED 12.44.44.0/24 7018 AT&T WorldNet Servic

Complete listing at http://thyme.rand.apnic.net/current/data-badAS

Advertised Unallocated Addresses
--------------------------------

Network Origin AS Description
24.225.128.0/18 36377 Comcast Telecommunications, I
24.225.192.0/23 36377 Comcast Telecommunications, I
24.225.192.0/18 36377 Comcast Telecommunications, I
24.225.224.0/21 36377 Comcast Telecommunications, I
24.225.237.0/24 36377 Comcast Telecommunications, I
24.225.248.0/21 36377 Comcast Telecommunications, I
41.222.79.0/24 36938 >>UNKNOWN<<
41.223.92.0/22 36936 >>UNKNOWN<<
46.18.104.0/21 23456 32-bit ASN transition
62.61.220.0/24 24974 Tachyon Europe BV - Wireless

Complete listing at http://thyme.rand.apnic.net/current/data-add-IANA

Number of prefixes announced per prefix length (Global)
-------------------------------------------------------

/1:0 /2:0 /3:0 /4:0 /5:0 /6:0
/7:0 /8:19 /9:12 /10:27 /11:81 /12:234
/13:463 /14:799 /15:1414 /16:11961 /17:5961 /18:10008
/19:19716 /20:26856 /21:26977 /22:36183 /23:34754 /24:192667
/25:1098 /26:1282 /27:741 /28:162 /29:4 /30:0
/31:0 /32:5

Advertised prefixes smaller than registry allocations
-----------------------------------------------------

ASN No of nets Total ann. Description
6389 2201 3564 bellsouth.net, inc.
18566 1868 1912 Covad Communications
23456 1562 3224 32-bit ASN transition
10620 1556 1661 TVCABLE BOGOTA
30036 1291 1328 Mediacom Communications Corp
7029 1288 1588 Windstream Communications Inc
11492 1111 1157 Cable One
7011 1058 1183 Citizens Utilities
1785 1052 1822 PaeTec Communications, Inc.
22773 942 1452 Cox Communications, Inc.

Complete listing at http://thyme.rand.apnic.net/current/data-sXXas-nos

Number of /24s announced per /8 block (Global)
----------------------------------------------

1:371 2:49 4:15 5:1 6:3 8:351
12:1951 13:1 14:534 15:13 16:3 17:5
20:10 23:32 24:1671 27:943 31:517 32:64
33:3 34:2 36:4 38:738 40:107 41:2503
42:45 44:3 46:982 47:3 49:231 50:413
52:13 54:2 55:7 56:2 57:34 58:869
59:493 60:376 61:1174 62:1086 63:1941 64:4031
65:2303 66:3928 67:1954 68:1100 69:3166 70:782
71:377 72:1854 74:2429 75:328 76:339 77:870
78:667 79:471 80:1127 81:844 82:503 83:491
84:685 85:1091 86:412 87:860 88:344 89:1544
90:232 91:4071 92:525 93:1147 94:1340 95:798
96:423 97:271 98:926 99:37 100:1 101:205
103:287 106:71 107:44 108:76 109:1013 110:665
111:746 112:320 113:439 114:565 115:719 116:918
117:698 118:886 119:1193 120:336 121:686 122:1607
123:1012 124:1348 125:1402 128:252 129:181 130:166
131:583 132:119 133:21 134:215 135:52 136:212
137:137 138:294 139:116 140:493 141:289 142:389
143:413 144:492 145:61 146:464 147:215 148:638
149:251 150:153 151:190 152:446 153:179 154:6
155:393 156:202 157:354 158:143 159:458 160:323
161:207 162:335 163:173 164:513 165:371 166:536
167:432 168:747 169:145 170:849 171:84 172:1
173:1648 174:631 175:391 176:174 177:246 178:997
180:1049 181:26 182:608 183:234 184:351 185:1
186:1420 187:661 188:939 189:866 190:5145 192:5921
193:5000 194:3525 195:3064 196:1238 197:147 198:3590
199:4108 200:5515 201:1634 202:8519 203:8532 204:4248
205:2326 206:2673 207:2830 208:4025 209:3462 210:2683
211:1462 212:2093 213:1766 214:774 215:76 216:4851
217:1597 218:550 219:347 220:1225 221:515 222:353
223:266

End of report
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